Top 7 Bookkeepers in the Boulder Area, CO (2026)
Key Takeaways
- Flatiron Advisors Tax & Accounting, in Louisville, ranks first with an Evidence Score of 63 at 86% coverage.
- We reviewed 31 firms here; 9 of the 10 that met the listing bar reached 70% evidence coverage, and the 7 with at least 6 documented items are numbered.
- Only 1 of 10 publishes a monthly price or a starting price, while 7 say nothing about fees.
- Compared with every firm we list, this group stands out on reporting: 5 of 10 state how often reports arrive (50% against 24%).
Sources cited in this article: DNS check, Firm's own website, IRS preparer records, State business registry, and our published methodology.
31 profiles reviewed, 10 met the listing bar, 9 scored (evidence coverage of 70% or more). 7 document at least 6 of the items we score and are ranked by Evidence Score; the other 2 are under the list as Also scored.
Firms on this page have offices in Longmont (5), Boulder (4) and Louisville (1). The page covers 32 towns and cities in the metro area, and a firm elsewhere in Colorado appears on the state page.
How this list is built: Methodology · Disclosures · About · Report a correction
This list numbers the 7 Boulder bookkeeping firms with enough documented evidence to rank, out of 10 that met our listing bar, and scores 2 more below it without a number. Narrow it by need first. The filters above the list cover catch-up work (1 firm), a published price (1) and remote service (4).
What firms here charge
We verified a monthly bookkeeping price for one of the 10 firms on this list: Left Hand Accounting publishes from $299 a month (for clients under $10K monthly revenue) on its own site, captured September 26, 2026 (source). For the other firms we have no verified monthly bookkeeping price; some may publish other pricing, so ask them for a quote.
Top 7 Bookkeepers in the Boulder Area, CO, Ranked by Evidence Score
- Flatiron Advisors Tax & Accounting (Louisville, CO). Evidence Score 63/100 at 86% coverage. Read the full profileDocuments 4 of 5 core services; states it prices by quote. Documented fit: technology, therapists; catch-up and cleanup work; QuickBooks Online users.Who they say they serve (self-reported): technology, therapists.
- Community Financials (Boulder, CO). Evidence Score 62/100 at 86% coverage. Read the full profileDocuments 3 of 5 core services; states it prices by quote; registered entity verified. Documented fit: technology.Who they say they serve (self-reported): technology.
- Trailhead Accounting Solutions CPA (Longmont, CO). Evidence Score 47/100 at 86% coverage. Read the full profileDocuments 2 of 5 core services; IRS preparer record found for a named person; registered entity verified. Documented fit: Xero users.
- Delta Effects (Boulder, CO). Evidence Score 44/100 at 80% coverage. Read the full profileDocuments 3 of 5 core services; registered entity verified.
- Ellis Bottom Line Bookkeeping (Longmont, CO). Evidence Score 38/100 at 74% coverage. Read the full profileDocuments 2 of 5 core services; registered entity verified.
- Left Hand Accounting (Longmont, CO). Evidence Score 37/100 at 70% coverage. Read the full profileDocuments 3 of 5 core services; IRS preparer record found for a named person; publishes a starting price. Documented fit: QuickBooks Online users.
- Pieper & Company, LLC (Longmont, CO). Evidence Score 27/100 at 86% coverage. Read the full profileDocuments 2 of 5 core services. Documented fit: real estate.Who they say they serve (self-reported): real estate.
Also scored
These firms reached 70% evidence coverage, but fewer than 6 of the items we score are documented for them, so they carry a score and no number.
| Firm | Where | Services documented | Software | Pricing | Credentials verified | Coverage (%) | Evidence Score |
|---|---|---|---|---|---|---|---|
| Kirkland & Company, CPA's, P.C. Says it serves: professional services | Longmont, CO | month-end close | Not verified | Not verified | Not verified | 78 | 27 |
| ABL&Co. Tax & Accounting | Boulder, CO Local + remote | payroll coordination | Not verified | Not verified | Not verified | 81 | 17 |
Top firms in Longmont
Trailhead Accounting Solutions CPA leads Longmont with an Evidence Score of 47/100 at 86% coverage. Also ranked in Longmont: Ellis Bottom Line Bookkeeping (38/100, 74% coverage), Left Hand Accounting (37/100, 70% coverage), Pieper & Company, LLC (27/100, 86% coverage).
Top firms in Boulder
Community Financials leads Boulder with an Evidence Score of 62/100 at 86% coverage. Also ranked in Boulder: Delta Effects (44/100, 80% coverage).
Comparison table
| Firm | Where | Services documented | Software | Pricing | Credentials verified | Coverage (%) | Evidence Score |
|---|---|---|---|---|---|---|---|
| Flatiron Advisors Tax & Accounting Says it serves: technology, therapists | Louisville, CO Local + remote | monthly bookkeeping, catch-up/cleanup, payroll coordination, month-end close | QuickBooks Online | Quote only (stated) | Not verified | 86 | 63 |
| Community Financials Says it serves: technology | Boulder, CO Local + remote | monthly bookkeeping, AP/AR, month-end close | Not verified | Quote only (stated) | Not verified | 86 | 62 |
| Trailhead Accounting Solutions CPA | Longmont, CO Local + remote | payroll coordination, month-end close | QuickBooks Online, Xero | Not verified | IRS preparer record | 86 | 47 |
| Delta Effects | Boulder, CO | AP/AR, payroll coordination, month-end close | Not verified | Not verified | Not verified | 80 | 44 |
| Ellis Bottom Line Bookkeeping | Longmont, CO Local | AP/AR, payroll coordination | QuickBooks | Not verified | Not verified | 74 | 38 |
| Left Hand Accounting | Longmont, CO | AP/AR, payroll coordination, month-end close | QuickBooks Online | Publishes a starting price | IRS preparer record | 70 | 37 |
| Pieper & Company, LLC Says it serves: real estate | Longmont, CO | payroll coordination, month-end close | QuickBooks | Not verified | Not verified | 86 | 27 |
Also listed (not scored yet)
These firms met the listing bar but have under 70% evidence coverage, so they are not ranked.
| Firm | Where | Services documented | Software | Pricing | Credentials verified | Coverage (%) |
|---|---|---|---|---|---|---|
| Arkose Advisors Says it serves: nonprofits | Boulder, CO | Not verified | Not verified | Not verified | Not verified | 26 |
What the evidence shows
Pricing
70% of the firms on this page say nothing about what they charge. 1 of 10 shows a monthly price or a starting price, and 2 say they quote. Figures the firms publish themselves, as their sites word them: Left Hand Accounting ("Starting at $299 a month"). A written scope with the fee and its limits is the thing to ask for on a first call.
Licenses and public records
Because Colorado publishes its records as open data, the checks for this group found 0 firms with an active CPA license or permit on Colorado's published register and 5 with a business registration found in the state's registry data. Any firm that says it's a CPA practice can be checked on the Colorado State Board of Accountancy lookup.
The ranking
Numbered scores on this list run from 63 down to 27, and the median across every scored firm is 38. 2 more firms reached 70% coverage with fewer than 6 documented items, so they sit under the list as Also scored, without a number. The top of the list: Flatiron Advisors Tax & Accounting (63 at 86% coverage), Community Financials (62 at 86% coverage) and Trailhead Accounting Solutions CPA (47 at 86% coverage). Longmont has the most numbered firms (4), and the list spans 3 towns in all. A high-coverage firm with a modest score isn't a weak firm. Its site simply leaves more for you to ask.
Boulder area in figures
Shares of the 10 firms listed, from accepted evidence only. A firm with no evidence for an item counts as not stating it. Median evidence coverage: 80.5%; median Evidence Score of the scored firms: 38.
| What the firms state | Share (%) | Firms (of 10) |
|---|---|---|
| Publish a price or starting price | 10 | 1 |
| State they price by quote | 20 | 2 |
| Say nothing about pricing | 70 | 7 |
| Hold a third-party-verified credential | 0 | 0 |
| State a reporting cadence | 50 | 5 |
| Describe onboarding | 20 | 2 |
| Offer catch-up or cleanup work | 10 | 1 |
| Work remotely (stated) | 40 | 4 |
| Mention QuickBooks Online | 30 | 3 |
| Mention QuickBooks | 20 | 2 |
| Mention Xero | 10 | 1 |
Frequently Asked Questions
Which Boulder bookkeepers publish their prices?
Left Hand Accounting shows a price or a starting price on its own site. Open a profile to see the exact wording and the page it came from.
Which firms in Boulder take on catch-up bookkeeping?
Flatiron Advisors Tax & Accounting says it does catch-up or cleanup work.
Which Boulder bookkeepers work in Xero?
Trailhead Accounting Solutions CPA names Xero on its site. More firms here name QuickBooks, so ask which one a firm prefers before you switch anything.
Which Boulder bookkeepers say which industries they serve?
5 of 10 name them on their own sites, among them Flatiron Advisors Tax & Accounting (technology and therapists), Community Financials (technology), Pieper & Company, LLC (real estate), Kirkland & Company, CPA's, P.C. (professional services) and Arkose Advisors (nonprofits). It's self-reported, so ask for a client reference in your trade.
Every place this page covers (32)
Allenspark, Altona, Bark Ranch, Bonanza Mountain Estates, Boulder, Crisman, Eldora, Eldorado Springs, Erie, Gold Hill, Gunbarrel, Hidden Lake, Jamestown, Lafayette, Lazy Acres, Leyner, Longmont, Louisville, Lyons, Mountain Meadows, Nederland, Niwot, Paragon Estates, Pine Brook Hill, Seven Hills, St. Ann Highlands, Sugarloaf, Sunshine, Superior, Tall Timber, Valmont, Ward.
Sources and further reading
Dates are when we checked. Report an error.
- DNS checkChecked Sep 26, 2026 to Oct 15, 2026
- Firm's own websiteChecked Sep 26, 2026 to Nov 9, 2026
- IRS preparer recordsChecked Sep 27, 2026
- State business registryChecked Sep 26, 2026
- Colorado State Board of Accountancy: license lookupColorado State Board of Accountancy
- Colorado business entity searchState of Colorado
- How the Evidence Score worksBookkeeping Index methodology
- Commercial disclosuresBookkeeping Index