Free deduction scan

See what you overpaid in taxes.

$0 scan*

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.

All states + DC + federal taxes

*Deduction finder scan and estimate is free up to 3 years. No credit card required. Complete tax self-file is $49 under $100,000 income, $99 above.

Deduction scan
ScanReviewFile
1 of 4 complete
Business mileageVehicle · L9
T-MobilePhone 80% · L25
Uber service feeFees · L10
Bay Bridge tollTolls · L9
Deductions found$2,201
Filing packetReady
Rules checked
All states selectable
CPA assisted help available
AI deduction finderFinds write-offs from 1099 income and expenses
Real bank dataUses actual transactions, not guesses
Tax-code rules shownEvery deduction keeps the rule beside the math
Federal + state filingSelf-file 1099 taxes, with CPA Screen available
Why Sourdough

If you receive a 1099-NEC from an app or any employer, the IRS treats you like a small business.

Sourdough helps you file taxes like a smart small business. Your gas, phone, gear, and platform fees can all be real tax write-offs. Sourdough connects every bank line with a tax rule and does all the math.

What it costs
Deduction scan
$0

No credit card required for a deduction scan and estimate up to 3 years.

Self-file
$49*

Federal and state self-file for workers under $100,000 income. $99 for AGI greater than $100,000.

Human in the loop
CPA Screen

Human-in-the-loop review you can add to the $49* self-file flow before federal and state filing.

Most tax apps were built for one job and one W-2. Sourdough starts with app income, miles, fees, and expenses.

What happens next

From scan to filing.

01

Start the deduction scan and choose your filing state.

02

Sourdough matches real transactions to tax-code rules and shows the math.

03

Self-file federal and state taxes, or add CPA Screen before filing.

Filing packet

What the scan gives you.

A clean packet: income, deductions, the rules used, and anything that still needs an answer. If filing is supported, you can continue from there.

Return packetReadyPDF, summary, and rule trace generated
Deduction rulesCheckedSchedule C categories matched to evidence
State scanReadyAll 50 states plus DC can start
Assisted optionAvailableComplete certified human review can be added at any time
See how it works

Your spending, turned into write-offs.

We sort each purchase and find what you can write off Checking account
DateMerchantWhat it counts asThe tax rule
03/14Shell #4421, gasTravelVehicle, actual§ 162(a) · Sch C L9
03/14DoorDash payoutGross receipts§ 61 · Sch C L1
03/18T-MobileUtilitiesPhone, 80% business§ 162(a) · Sch C L25
03/22AutoZone, floor matsVehicle, supplies§ 162(a) · Sch C L22
03/29Uber service feeBank feesCommissions paid§ 162(a) · Sch C L10
04/02Costco coolerEquipment, §179§ 179 · Sch C L13
04/05Home office, rentHome office, simplified§ 280A(c)(5) · Form 8829
04/11Q1 estimated taxNot deductibleForm 1040-ES
Every write-off comes with the IRS rule behind it, so you know what changed. The scan is free; supported filing starts at $49. CPA Screen is an additional charge.
Free deduction scan

Start your deduction scan.

$0 scan. Choose your state to start.

● 50 STATES + DC Where do you file?
50 states + DC
Tap a state, or pick it from the menu. Free scan signup is open nationwide.
Past years — optional
Did you file taxes for 2023?
Did you file taxes for 2024?
Did you file taxes for 2025?
Before you start

Common questions.

Still unsure? Call or text (424) 487-4642.

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.

See what you overpaid in taxes.

Run the free deduction scan. See the math and tax-code rules, then file for a refund.

Free scan and signup are open in all 50 states.