#estimated-taxes
Quarterly estimated tax payments, safe-harbor rules, and underpayment-penalty planning for taxpayers with income outside payroll withholding
Most wedding calligraphers charge $2.50–$6 per envelope, but the rate that pays is your own — hourly math, spoilage, rush tiers, and 15.3% self-employment tax.
Form 2210 Schedule AI matches each IRS estimated-tax installment to income earned by March 31, May 31, Aug 31 and Nov 30 — it can only shrink your penalty.
The IRS holds interest at 7%, compounded daily, for Q4 2026 — a $10,000 balance costs about $178 a quarter, matching the estimated-tax penalty rate.
A teen owes a tax return at just $400 of net self-employment income — no age minimum. How the 15.3% SE tax, the $1,000 estimated-tax tripwire, the $20,000 1099-K threshold, and a custodial Roth IRA fit together.
Kick pays streamers 95% of subscriptions and KICKs through Stripe, and the OBBBA raised the 1099-NEC reporting threshold from $600 to $2,000 for payments made on or after January 1, 2026 — but streaming income is taxable from dollar one, and $400 of net profit triggers self-employment tax whether or not a form arrives.
Bug bounty payouts from HackerOne and Bugcrowd are ordinary income from the first dollar, and for 2026 platforms only issue 1099s at $2,000 per researcher — but the income is taxable with or without a form. Covers W-9 setup, the hobby-versus-business test that decides whether tooling is deductible, self-employment tax, and quarterly estimates.
AI data-labeling and RLHF gig income arrives with nothing withheld, so annotators owe 15.3 percent self-employment tax plus income tax on every payout and must pay quarterly estimates by the 2026 deadlines. This guide covers the 1099-NEC and 1099-K thresholds, the 90/100/110 percent safe-harbor rules, Schedule C deductions most annotators skip, and a 20-minute-a-month bookkeeping system for multi-platform payouts.
Original issue discount makes you report interest income each year on bonds that pay no cash until maturity. This guide covers where OID hides — zero-coupon bonds, T-bills, TIPS, seller-financed notes — the 0.25%-per-year de minimis threshold, how to read Boxes 1, 2, 6 and 8 of Form 1099-OID, and the basis and state-tax mistakes that make investors overpay.
A working bookkeeping system for freelance and bridal makeup artists — separate business accounts, retainers recorded as liabilities until the wedding day, kit split into consumables versus equipment, mileage logged at the 2026 IRS rates of 72.5 and 76 cents per mile, and a peak-season reserve sized to cover the roughly six quiet months outside the May–October wedding window.
Prediction market winnings from Kalshi and Polymarket are taxable even without a 1099, but the IRS has issued no guidance on how — ordinary income, gambling income under Section 165(d) with a 90% loss-deduction cap starting in 2026, or Section 1256 60/40 treatment. Here are the forms to expect, the crypto-settlement wrinkle, and the recordkeeping that survives an audit.
Form 4868 gives a sole proprietor an automatic six-month extension to file Form 1040 and Schedule C — moving the 2025 return deadline from April 15 to October 15, 2026 — but the tax itself was still due in April. How to estimate total liability including self-employment tax, request the extension electronically or through a designated payment, and limit the 5%-per-month failure-to-file penalty.
Australia's 2026–27 Federal Budget expands the ATO's Dynamic PAYG instalments pilot, targeting broader accounting-software adoption from July 2027 alongside an announced — but not yet legislated — monthly payment option. This guide separates confirmed changes from proposals, explains why bookkeeping quality decides whether software-calculated instalments help, and lays out the monthly close, tax-reserve forecast, and variation evidence trail small businesses can build now.
