TIN Compliance Calendar 2026–2027: Every 1099, 945 and W-9 Date

TIN compliance calendar: every date for 2026 and 2027

Filing and statement due dates, Form 945, the solicitation deadlines, the CP2100 and 972CG seasons, penalty tiers and W-8 expiry, on one calendar. Filter by category, add your own CP2100 or account-opening dates and get the computed deadlines placed on the same grid, then download it or subscribe.

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Add your own dates

Computed with the same business-day rules as the calculators (weekends and federal holidays skipped). Saved in this browser only; nothing is sent anywhere.

Date on a CP2100 or CP2100A notice

Date an account was opened without a TIN

Date on a Notice 972CG

I backup withhold: show monthly Form 945 deposit dates (15th, monthly depositor)

How the dates were set

Due dates that fall on a Saturday, Sunday or legal holiday move to the next business day (IRC 7503); the moved date is the one shown. Penalty tiers use the amounts for returns due in 2026 (Rev. Proc. 2024-40) and for returns due in 2027 (Rev. Proc. 2025-32); the three tiers are $60, $130 and $340 in both years. Entries marked “expected” follow the IRS’s usual schedule and are confirmed when the IRS announces the date. The CP2100 and 972CG entries mark the seasons in which the IRS usually mails those notices, not fixed dates; your own notice date sets your deadlines, which is what the “Add your own dates” panel is for. Form 945 deposit dates assume a monthly depositor; semiweekly depositors follow the Wednesday/Friday schedule in the Form 945 guide. Every figure and date is sourced on the figures page.

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