An accounting firm in Littleton makes one claim that almost no other local trade can make in the same way: the three letters after the principal's name are issued by the state, and the state publishes the entire file. The Colorado State Board of Accountancy, inside the Department of Regulatory Agencies, maintains every CPA licence ever granted in Colorado, and the Division of Professions and Occupations releases the full register as open data — name, licence number, first-issue date, expiry, current status, and any disciplinary case attached to the record. Checking a Littleton CPA therefore takes about a minute and requires no one's permission. That changes what a ranking in this category should weigh. Marketing copy is cheap; a licence number that resolves to an Active entry in the state's own file is not.
Littleton itself complicates the picture in two ways worth understanding before you engage anyone. First, the postal place called Littleton is much larger than the city: ZIP codes such as 80123 and 80127 carry a Littleton address across neighborhoods that sit outside the municipal boundary, so a firm with Littleton on its letterhead may answer to Jefferson or Douglas County rather than the city itself. Second, the city is a home-rule municipality that administers its own sales and use tax — the city publishes a rate of 3.75 percent — and Colorado's Department of Revenue is explicit that a business located in a self-collecting jurisdiction must open a sales tax account with that city directly, separate from its state account. Because Littleton spans portions of Arapahoe, Jefferson, and Douglas counties, the combined rate at a given address also depends on which county the address sits in. A firm that genuinely works here fields both questions without reaching for a manual, and either one makes a fair competence test for a prospective accountant.
Every firm below passed the same screen. It had to publish a street address with a Littleton, Colorado postal address on its own website, together with a phone number readable from the same site. The licence of at least one named principal had to appear in the state register with an Active status, and we recorded each licence number and first-issue date so any reader can re-run the check independently. A register entry carrying a disciplinary stipulation was disqualifying, and that rule cost two otherwise-plausible candidates their place. Twelve firms entered the screen; six cleared it. They are ordered by the weight of independently verifiable credentials — licence depth, multi-CPA bench, third-party registrations, and tenure — not by any judgement about the quality of the advice itself, which no outside reviewer is positioned to grade.
How We Evaluated Littleton Accounting Firms
The Top 6 Accounting Firms in Littleton
2026 Rankings · Littleton, Colorado
WhippleWood CPAs
The heaviest stack of independently checkable credentials in this category, starting with the licence. Colorado's register lists Richard J. Whipple Jr under CPA number 5486, first issued on 4 December 1979 and Active through the current cycle, at a Littleton 80127 address matching the firm's Shaffer Drive office. Three further named partners verify the same way: Mona Lynn Feeley holds Active licence #17265, first issued in 1997, and the Better Business Bureau rates the firm A+ on a file that records the business starting in January 1976 — a half-century of continuous operation under the founding family's name. The firm's own site dates its audit and assurance work to 1981.
What separates WhippleWood from every general practice on this list is the tier of oversight it has voluntarily entered. The firm states it has been registered with the Public Company Accounting Oversight Board since February 2021 — the federal regulator created to oversee auditors of public companies — and its published practice runs to financial statement audits, ERISA benefit plan audits, compilations and reviews, peer reviews for other CPA firms, business valuation, and forensic accounting. PCAOB registration can be confirmed on the Board's public registered-firms search, which is exactly the kind of second, independent register this ranking rewards. Most Littleton households and small businesses will never need a public-company-standard audit; the point is that the firm operating at that standard also fields ordinary engagements, and its file is the deepest here.
Bender, Lang & Posey CPAs, PC
Three Active licences across two generations of practitioners, which no other firm on this list matches. The state register shows Thomas Russell Lang under CPA #10192, first issued on 25 September 1986; Laura Aileen Posey under #32151, first issued in 2014; and Christopher Reed Posey under #9038680, first issued in 2023 — all three Active through the current cycle. The firm describes more than fifty years of service to the Denver metro community, a lineage that ran for decades as Bender & Lang before the Posey generation joined the name. The Better Business Bureau rates the practice A+, recording the present professional corporation from June 2020 with Chris Posey as managing member — a register artifact of the entity change, not of the firm's actual age.
The published scope is the classic Main Street portfolio done at depth rather than breadth: tax planning and preparation for individuals, partnerships, C corporations, S corporations, trusts, and estates; small-business consulting covering entity selection, owner compensation, quarterly estimates, and purchase and sale planning; and monthly bookkeeping, payroll, and QuickBooks setup and support. The Southpark Plaza office sits inside the city proper in the 80120 ZIP, and the succession already visible in the register — a 1986 licence working alongside a 2014 and a 2023 licence — answers the question long-tenured sole practices cannot: who handles your file when the founding partner retires.
WMS Group, P.C.
The only firm on this list that prints its principals' Colorado certificate numbers on its own website — the transparency this entire ranking exists to reward. WMS Group's site identifies Brian W. Weibler under Colorado Certificate #20045 and Patrick A. Stokes under #34191, and both entries resolve exactly as claimed: the register shows Weibler's licence first issued on 15 December 1999 and Stokes's on 15 September 2016, both Active through the current cycle. The register even lists the firm's own Prince Street office as the mailing address on Weibler's entry, closing the loop between the licence file and the front door. The office sits in downtown Littleton's 80120 ZIP, inside the city.
The practice describes itself as tax, assurance, and consulting under one roof: strategic tax planning and return preparation, audits, reviews, and compilations of financial statements, and financial analysis and planning for closely held businesses. Weibler's published background runs more than 25 years with closely held companies in construction, service, and manufacturing — sectors where the sales and use tax, payroll tax, and personal property tax filings the firm lists are precisely the returns that go wrong most often. For a Littleton business that wants attest capability and tax work from the same mid-sized bench, and a firm confident enough to publish the numbers a reader needs to check it, this is the strongest match here.
Add Valorem, LLC
Two principal licences, both around three decades old and both Active. The state register lists founder Wendy S. Campbell under CPA #17492, first issued on 25 June 1997, at a Littleton 80120 address, and principal Donna H. Bornhofen under #15677, first issued on 25 January 1995 — the two entries together giving this firm the second-deepest active licence bench in the category. Campbell's published biography dates her Denver accounting career to 1981, with a master's degree from the University of Colorado earned while building the practice, and Bornhofen brings a stated 25 years of accounting and taxation experience with both a BS and MS in accounting from the same university.
The firm's own description of itself is the useful differentiator: a full-service CPA firm licensed in Colorado that argues, in its own words, that many owners need much more than compliance work. The published services lean accordingly toward the advisory end — strategic business planning, entity formation, bank financing support, payroll, and strategic tax services — sitting on top of the ordinary preparation work. The Dry Creek Circle office is in the 80120 ZIP inside the city. For an owner who wants the annual return to come with an opinion about the business rather than just a signature, this is the most explicitly advisory practice of the six.
Sheldon I. Brown, CPA, LLC
The second-oldest individual licence on this list. Colorado's register shows Sheldon I. Brown under CPA #9308, first issued on 24 June 1985 and Active through the current cycle, at a Littleton 80123 address consistent with the Cross Drive office the firm publishes. Four decades on a single continuously maintained licence with no disciplinary case attached is the entire argument for this placement, and it is an argument read from the state's file rather than from the firm's marketing. The Better Business Bureau lists the practice as Not Rated — which the BBB itself describes as insufficient information rather than an adverse finding — on a business it records from December 2004.
The published scope is unusually wide for a single-principal office: tax preparation and planning, IRS problem resolution including audits, back taxes, payment plans, and innocent spouse relief, small-business accounting, QuickBooks setup and training, part-time CFO services, payroll, personal financial planning, retirement and estate planning, business formation, and nonprofit accounting. The Cross Drive address carries a Littleton postal address in the 80123 ZIP, in the Columbine area west of the city boundary — worth knowing if municipal filings are part of your engagement. The trade-off is the one every sole practice presents: a single named CPA accountable for everything, and no bench behind him.
Nielsen & Moore, C.P.A.
The newest licence on this list, which is the reason for the placement and not a comment on the work. The state register lists managing partner Nathan Moore under CPA #9037054, first issued on 17 December 2020 and Active through the current cycle, at a Littleton 80120 address matching the Canal Court office the firm publishes. The firm describes over 30 years of accounting experience across its team — Moore practiced before licensure and staff accountant Andrea Nielsen adds her own tenure — but this ranking scores what the register can verify, and the register dates the managing partner's licence to 2020.
What the practice offers in exchange for the shorter licence history is a deliberately modern model: tax, accounting, and advisory combined so that the return is an output of year-round planning rather than a spring transaction. The firm's site frames its approach around reliable accounting information and strategic decision-making aligned with the client's goals, which in practice means monthly involvement rather than an annual handoff. The Canal Court office sits near the Aspen Grove corridor in the 80120 ZIP. For a newer Littleton business that wants an accountant embedded in its numbers all year — and is comfortable trading licence tenure for that attention — this is the fit; for readers who weigh the register above all, the five firms above carry deeper files.
Frequently Asked Questions
How do I verify that a Littleton accountant holds an Active Colorado CPA licence?
Go to the state's own records, not the firm's website. The Colorado Department of Regulatory Agencies maintains the public CPA licence register, and its Division of Professions and Occupations publishes the complete CPA register as open data on the Colorado Information Marketplace — searchable by name, showing the licence number, first-issue date, expiry, status, and any disciplinary case on the record. The status you want is Active; entries reading Expired, Inactive, or Beyond 6 Years Expired do not permit someone to hold out as a practising CPA. For a preparer licensed in more than one state, NASBA's CPAverify search cross-checks jurisdictions nationally. Every licence number cited on this page was read from the Colorado register and can be re-checked the same way in under a minute.
What is the difference between a CPA, an enrolled agent, and an unlicensed tax preparer?
The credentials come from different regulators and carry different powers. A CPA is licensed by a state board — in Colorado, the State Board of Accountancy — and is the only one of the three who can perform attest engagements such as audits and reviews of financial statements. An enrolled agent is credentialed by the IRS, specialises in tax, and has unlimited rights to represent taxpayers before the IRS, but cannot sign an audit opinion. Anyone else can prepare returns for pay with nothing more than an IRS Preparer Tax Identification Number, and such preparers have sharply limited representation rights if the return is examined. The IRS publishes a Directory of Federal Tax Return Preparers with Credentials and Select Qualifications where you can confirm which category a preparer actually falls into.
Does Littleton collect its own sales tax separately from the state?
Yes. Littleton is a home-rule city that administers its own sales and use tax — the city publishes a rate of 3.75 percent — and the Colorado Department of Revenue states plainly that a business located in a self-collecting jurisdiction must apply for a sales tax account with that city, separate from its state account. Littleton also spans portions of Arapahoe, Jefferson, and Douglas counties, so the combined rate at a given address depends on which county portion the address sits in; the Department of Revenue's DR 1002 publication and its address-level GIS lookup give the authoritative figure for any location. Whether your accountant can explain the city filing and the county-line question without looking it up is a fair test of whether the firm genuinely works in Littleton.
What does an Active status on the Colorado CPA register actually mean?
It means the licence is current inside Colorado's two-year renewal cycle. Licences renew on 30 November of odd-numbered years, and the continuing education reporting period runs from 1 January to 31 December biennially, ending in odd years. Across each period a licensee must complete 80 hours of continuing professional education, including four hours of ethics of which no more than two may cover Colorado Rules and Regulations. This cycle is also why every licence cited on this page shows the same expiry of 30 November 2027 — that is the end of the current statewide period, not a fact about any individual firm. An Active status alongside a decades-old first-issue date means the CPA has cleared that education bar every two years without interruption.
What does PCAOB registration mean, and does my business need a PCAOB-registered firm?
The Public Company Accounting Oversight Board is the federal regulator that oversees the auditors of public companies, and it maintains a public search of every registered firm, together with their filings, inspection reports, and any disciplinary actions. Registration means a firm has entered that oversight regime and may audit companies whose securities trade publicly. A typical Littleton household or privately held small business does not need a PCAOB-registered auditor; ordinary audits, reviews, and compilations are performed under AICPA standards by any licensed CPA firm with an attest practice. The registration matters here as evidence: a firm that submits to federal audit inspection carries a second independent register a reader can check, on top of the state licence file.
What should I confirm before signing an engagement letter with a Littleton accounting firm?
Start with the licence: take the number from this page or ask the firm for it, and confirm the Active status on the state register yourself. Then ask who will actually prepare and sign your return — in multi-partner and family firms the named principal is not always the preparer. Ask whether fees are fixed or hourly, what falls outside the quoted scope, and whether representation in an IRS or Colorado Department of Revenue examination is included or billed separately, because that is where engagements most often surprise clients. If your business files Littleton city sales tax, confirm the firm handles self-collected municipal returns, not just the state ones. And if you need an audit or review rather than tax work, confirm the firm offers attest services and is independent of your business under the applicable standards.
Sources & References
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Colorado DORA, Division of Professions and Occupations (Colorado Information Marketplace)
CPA — All Status (complete Colorado CPA licensee file)
The state licence register itself. Every licence number, first-issue date, status, and disciplinary flag cited on this page was read from this file during research.
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Colorado DORA, Division of Professions and Occupations
Colorado State Board of Accountancy — program information
The board that issues, renews, and disciplines every Colorado CPA licence.
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NASBA Registry of CPE Sponsors
Colorado CPE requirements for CPAs
Backs the 30 November odd-year renewal date, the 80-hour biennial CPE requirement, and the four-hour ethics component described in the FAQ.
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National Association of State Boards of Accountancy (NASBA)
CPAverify public search — national CPA licence verification
Cross-checks a Colorado licence against other jurisdictions for preparers who practise in more than one state.
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Colorado Society of CPAs (COCPA)
Becoming a CPA — Colorado education, exam, and experience requirements
Backs the description of what a Colorado CPA licence requires: 150 semester hours of coursework, 1,800 verified work hours, and the AICPA ethics exam.
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Internal Revenue Service
Choosing a tax professional — Directory of Federal Tax Return Preparers with Credentials and Select Qualifications
The federal directory behind the CPA, enrolled agent, and PTIN-only preparer distinction drawn in the FAQ.
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Colorado Department of Revenue, Taxation Division
How to Look Up Sales & Use Tax Rates — self-collecting home-rule jurisdictions
States that a business located in a self-collected jurisdiction must apply for a sales tax account with that city, and points to the address-level GIS rate lookup.
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Colorado Department of Revenue, Taxation Division
DR 1002 — Colorado Sales/Use Tax Rates Publication
The state's authoritative publication of state, county, city, and special-district sales and use tax rates, including self-collected home-rule cities such as Littleton.
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City of Littleton
Littleton City Code (Municode) — municipal sales and use tax provisions
Source for the city's self-administered sales and use tax and its published 3.75 percent rate. Answers HTTP 403 to automated fetchers while serving normally in a browser; open it by hand.
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Public Company Accounting Oversight Board (PCAOB)
Registered Firms — public search of PCAOB-registered audit firms
Where a reader can independently confirm a firm's PCAOB registration, filings, and inspection history, including the registration WhippleWood CPAs states it has held since February 2021.
Our Recommendation
For the deepest independently checkable file in Littleton, WhippleWood CPAs stands alone: a principal licence Active since 1979, a Better Business Bureau record running to 1976, and a PCAOB registration that puts the firm under a second, federal register anyone can search. For a family or small business that wants a long-lineage tax practice with visible succession, Bender, Lang & Posey pairs a 1986 licence with two newer ones across generations. WMS Group earns its place by doing what this publication wishes every firm did — printing its certificate numbers on its own site — and Add Valorem brings the most explicitly advisory model behind two nearly thirty-year licences.
Whichever office you call first, finish with the one step that costs a minute and nothing more. Take the licence number from this page, open the Colorado licence lookup or the open-data register, and read the status yourself. In this category the state has already done the hard verification work and published it; a reader who checks the file is exactly as well-informed as we are, which is how a ranking like this one should be built.
Denver Dean's List maintains editorial independence. We do not accept payment for rankings or accept advertising from the companies we evaluate. Rankings are based on state licence records, publicly available reviews, verified credentials, and editorial research. Nothing on this page is tax, accounting, or legal advice, and no outcome of any kind is stated or implied. Licence status changes; verify it yourself before engaging any firm.