Free deduction scan50 states + DC
See what you
overpaid
in taxes.
Sourdough checks your expenses against federal and state deduction rules and uses AI to find write-offs for 1099 income.Gig workers and anyone paid on a 1099 see deduction math across their transactions, cited tax-code rules, then click to file for a refund.
Deduction scan and estimate free up to 3 years. No credit card required.
See how it works
Your spending, turned into write-offs.
Sourdough connects every bank line with a tax rule and does all the math.
Tax-code citation§ 162(a)Business phoneSchedule C · Line 25
Deduction$96.00$120.00 × 80% business use
Only the business share goes into the deduction.
4 / 4 transactions checkedDeductions found · example
Example complete. Select a purchase to follow its path.
Illustrative transactions and business use. This is a deduction total, not a refund estimate. Scan your own expenses
View all example calculations
| Transaction | Amount | Business use | Deduction |
|---|---|---|---|
| T-Mobile | $120.00 | 80% | $96.00 |
| Uber service fee | $48.60 | 100% | $48.60 |
| Bay Bridge toll | $12.50 | 100% | $12.50 |
| Personal groceries | $42.80 | 0% | $0.00 |
| Total deductions | $157.10 | ||
Sourdough matches real transactions to tax-code rules and shows the math.
Self-file federal and state taxes, or add CPA Screen before filing.
What it costs.
Federal + state self-filefrom $49
Scan and estimate up to 3 years for free. Self-file is $49 under $100,000 income; $99 above. CPA Screen is a separate paid add-on.
Common questions.
Is my bank information safe?
We connect through Plaid with your permission. Sourdough does not store your bank password and cannot move money. We read transactions to classify income and expenses.
Do you support my state?
Yes. The free deduction scan and signup are open in all 50 states. Pick your state in the form and start from there.
When do I pay?
The scan is free. Self-file is $49 if you earned under $100,000 and $99 above. You only pay if you choose to file through Sourdough.
What happens after the scan?
You get a scan packet that separates income, deductions, tax rules, and open questions. If filing is available for your situation, you can continue from there.
Can a real person check my return?
Yes. Assisted review is a separate paid CPA, EA, or CTEC workflow.
Free scan and signup are open in all 50 states. Call or text (424) 487-4642.