Combinely joins Y Combinator X25

AI Co-Worker
for Tax Teams.

An AI coworker that handles tax prep, reviews returns and answers complex tax questions - in Microsoft Office.

Team from

Deloitte
Google
Monzo
Y Combinator
University of Cambridge
Columbia Law School
Deloitte
Google
Monzo
Y Combinator
University of Cambridge
Columbia Law School

Platform

Augment your work inside Microsoft Office

01

AI Tax Return Review

Reviews complex tax returns before manager review and catches up to 75% of common errors. Flags inconsistencies, calculation issues, and missed optimization opportunities across all schedules, cutting manager review time per return by ~50% and reducing late rework during peak season.

Form 1040 - Tax Return
Schedule E - Page 1
Line 3 - Rents received$48,500
Line 5 - Advertising$1,200
Line 6 - Auto and travel$3,400
Line 9 - Insurance$2,100
Line 12 - Mortgage interest$18,200
Line 18 - Depreciation$12,500
Combinely Review
Rents match workpaper total
Mortgage interest tied to bank
Depreciation variance

Fixed asset schedule shows $12,800. Verify correct amount.

02

Tax Prep Workflows

Automates tax prep from source to return. Extracts Client data (K-1s, 1099 and more), maps values to the right schedules, and cross-checks totals across forms - cutting manual entry by ~70% and reducing late-stage rework during peak season.

Schedule K-1 (Form 1065)
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ProSystem fx Tax
Schedule E - Supplemental Income
Line 13H
Investment Interest Expense
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Line 9A
Net Long Term Capital Gain
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Line 20AE
Excess Taxable Income
-
Importing...
$29,970 total
Extracting from K-1...
0 of 3 fields extracted
Processing
03

Tax Research & Client Questions

Drafts tax opinions for client queries using trusted sources and client context, reducing partner email volume while keeping full control over the final advice.

Can we claim R&D tax credits for wages paid to our AI engineering team this year?

Researching...
Assessing query and client context
Searching and prioritizing sources for relevance

Security

Built for trust

Enterprise-grade protection with industry-leading security standards. Your client data deserves nothing less.

Learn more about security

SOC 2 Type II

Certified compliance with rigorous security standards

Trusted Data Storage

Flexible storage options matching your data sensitivity and compliance needs

No AI Training

Your data is never used to train or fine-tune any AI models

Strict Access Controls

Every access request is verified and logged with controlled permissions

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