📋 Monthly Tax Checklists
What you need to do each month — filtered by your business type.
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October 2026 — Action List
THE biggest month. Form 11, Preliminary Tax, income tax balance all due 31st.
- File P30 PAYE/PRSI (September) via ROS by 23rd High
- File Form 11 via ROS by 31st (paper) or 17 November (ROS) High
- Pay Preliminary Tax for current year by 31st High
- Pay prior year Income Tax balance by 31st High
- Confirm CGT position — first period deadline 15 December Medium
- File any MyAccount claims (rent, medical, flat-rate expenses) Medium
Other months
January
Start the year right: LPT, year-end accounts, VAT3 for November/December.
February
Monthly payroll returns due. Review your tax credit certificate.
March
VAT3 for January/February and monthly payroll. Q1 bookkeeping review.
April
Monthly payroll returns. Review preliminary tax strategy for October.
May
VAT3 for March/April, payroll, and Form 46G for December year-end companies.
June
Payroll returns, Corporation Tax preliminary payment for December year-end companies.
July
VAT3 for May/June, payroll. Mid-year compliance health check.
August
Monthly payroll returns. Begin preparing for October deadlines.
September
VAT3 for July/August, payroll, CT1 for December year-end companies.
November
Form 11 ROS extended deadline. VAT3 for September/October. Payroll.
December
CGT payment for Jan–Nov gains due 15th. Payroll. Year-end planning.