Your Schedule C is not a document you write once a year. It is the running total of what you already logged — if something is keeping that total.
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1099 income arrives with no tax withheld. Nothing is set aside unless you set it aside, and nothing tells you how much until you do the math. The surprise is not that the bill is large — it is that it is unknown until the moment it is due.
Self-employment tax is the part that catches people. It funds Social Security and Medicare, and it applies on top of income tax. SoloDesq works it into the estimate rather than leaving it as a footnote you discover later.
You do not enter anything twice. The receipt you photographed and the trip you logged are already on the Schedule C line they belong to, so the total is current the moment you look at it.
Mileage is applied at the IRS standard rate in effect on the date of the trip — which matters in a year like 2026, when the rate changed partway through.
Pick a quarter on the Tax Dashboard and SoloDesq builds the estimate from what you actually recorded: paid invoices and logged income, minus your Schedule C expenses and the mileage deduction. That is your net profit for the quarter — the same basis Schedule C uses, not a percent of gross.
Self-employment tax is 15.3% on 92.35% of net profit, and the app handles the fine print: the Social Security portion stops at the annual wage base, the extra 0.9% Medicare surtax starts at your filing status’s threshold, and earlier quarters carry forward so Q4 is not double-charged. Set your federal marginal rate and filing status once, and a federal figure is added — with half of SE tax deducted first, as the IRS allows.
It does not file your return, and it is not a tax preparer or advisor. It keeps the books so the numbers are ready, and you file with whoever you already use — your accountant, or the filing software you already pay for.
Some mileage apps bundle a filing service at a higher annual price. That is a different product at a different cost, and worth comparing on its own terms.
Log as you go, and let the Schedule C total keep itself.
SoloDesq is bookkeeping software, not a tax preparer or tax advisor, and does not file returns. Estimates are estimates. For advice on your own situation, talk to a qualified tax professional.