Stored on this device only. Photos are compressed so a year of receipts still fits.
Record a transaction
What did you buy?
Every entry lands on a real Schedule C line, so at filing time you're reading totals instead of sorting a shoebox.
I expect a 1099 for this — flag it so I can reconcile the forms in January
Sales tax was collected on this — send it to the Sales tax tab
Ledger
Vehicle
Mileage log
Miles are worth real money and almost nobody tracks them. Each trip needs a date, destination, and reason to hold up.
Trips
Sales tax
What you collected, and what you owe
Sales tax is not your money. You collect it on the state's behalf and hand it over. Mark income entries as taxable in the ledger and it lands here.
Rates and rules vary by state, city, and what you sell. Zack Tax does not look up your local rate or decide what is taxable. Check your state comptroller and set the rate yourself.
Texas is 6.25% state plus up to 2% local, capped at 8.25% combined. Texas uses origin-based sourcing for in-state sellers, so your own location sets the rate.
Before you decide
What would this do to my taxes?
Tick a move you are considering and see the effect before you make it, not in April when it is too late to change.
Entity choice
Would an S-corp election save you money?
A sole proprietor pays self-employment tax on every dollar of profit. An S-corp splits profit into salary (taxed) and distributions (not taxed for FICA) — but adds payroll, paperwork, and scrutiny.
This is a rough comparison, not a recommendation. The IRS requires S-corp owners to pay themselves reasonable compensation for the work they do, and underpaying salary to dodge tax is a known audit trigger. Talk to a CPA before electing.
Extra cost covers payroll service, the separate 1120-S return, and state fees. $1,500–$3,000 a year is typical.
Estimated taxes
An estimate of what to send the IRS, and when
Self-employment income has no withholding, so you pay it in four installments. This covers all your businesses together — you file one return no matter how many you run.
Estimate only — verify with your preparer before you pay. Zack Tax is not a tax preparer and does not file returns. Federal only; state and local taxes are not included.
The rates and thresholds here are taken from IRS Revenue Procedure 2025-32 and SSA figures for 2026. The calculation itself has not been reviewed by a tax professional. Known simplifications: the QBI deduction is a flat 20% and does not model the phase-in limits above the threshold, the 2026 minimum QBI deduction, or the minimum qualified business income needed to claim it. Depreciation, credits, and anything unusual in your situation are not modelled at all.
Treat the number below as a starting point for a conversation with a preparer, not as the amount you owe.
The rates and thresholds here are taken from IRS Revenue Procedure 2025-32 and SSA figures for 2026. The calculation itself has not been reviewed by a tax professional. Known simplifications: the QBI deduction is a flat 20% and does not model the phase-in limits above the threshold, the 2026 minimum QBI deduction, or the minimum qualified business income needed to claim it. Depreciation, credits, and anything unusual in your situation are not modelled at all.
Treat the number below as a starting point for a conversation with a preparer, not as the amount you owe.
Total tax liability, not your refund or the balance you paid in April.
Over $150,000 raises the safe harbor from 100% to 110%.
People you pay
1099 contractor tracker
If you pay someone who is not an employee, you may owe them a 1099-NEC in January. Track them as you go and the paperwork is already done.
I have a signed W-9 on file with their TIN
Contractors
Your tax file
Document vault
Keep W-2s, 1099s, prior returns, and anything else you will need at filing time in one place.
These files never leave your device. They are stored in this browser only, not uploaded anywhere. That also means a backup is the only copy — download one after you add documents.
PDFs and photos. Large files are rejected — scan or photograph rather than saving a 20 MB original.
Stored documents
What you should have on hand
Step by step
Get ready to file
Answer a few questions and Zack Tax builds your filing worksheet — every figure organized by form and line, plus the documents you still need.
This prepares you to file. It does not file. Zack Tax is not a tax preparer and cannot transmit a return to the IRS. You will take this worksheet to filing software or a preparer. Nothing here is tax advice.
How well are you documented?
Records checkup
Deductions get disallowed for weak records more often than for being wrong. This looks for the gaps an examiner would find.
Year to date
Your Schedule C, so far
This is the sheet you hand a preparer, or type into filing software line by line.
Take it to your preparer
Everything a CPA needs, in the formats they actually use.
Your deadlines
Tax calendar
Only the dates that apply to you, based on what you have logged and how you answered the walkthrough.
Start here
Your first year self-employed
Nobody hands you a manual when you start working for yourself. This is the short version of what changes.
General information, not advice. This explains how the rules work. It cannot tell you what to do in your situation — that depends on facts only you and a preparer know.
Commonly missed
Write-offs people forget
Check what applies to you. These are ordinary and necessary business expenses that routinely go unclaimed — confirm your specifics with a preparer.
Plain English
Glossary
Every term the app uses, defined without jargon.
Protect your records
Backup
Browser storage is not permanent. Clearing browsing data erases everything, and phone browsers evict data from sites you haven't opened in a while. Back up and you can restore on any device.
Keep it on your home screen
On iPhone: tap Share, then Add to Home Screen. Installed this way, Safari stops clearing your records and the app opens full screen.
Your setup
Only drives the running tape. The Quarterly tab does the real calculation.
Night sky is easier on the eyes after dark. The starfield pauses if your device has reduced motion turned on.
Your businesses
Device storage
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Zack Tax is a record-keeping tool. It is not tax advice, not a tax preparer, and does not file returns.
Figures use published 2026 federal rates and are estimates for planning — your situation may differ, and state taxes are not included. Confirm with a qualified preparer before you file. Rates and thresholds last reviewed 12 August 2026 against IRS Rev. Proc. 2025-32, IRS Announcement 2026-11 (mileage), and SSA figures. The calculation logic has not been reviewed by a tax professional.
Everything stays on this device, in this browser. Nothing is uploaded to any server.
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Home · Find a CPA · Privacy · Terms · Zackary Labz