📋 Monthly Tax Checklists
What you need to do each month — filtered by your business type.
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September 2026 — Action List
VAT3 for July/August, payroll, CT1 for December year-end companies.
- File P30 PAYE/PRSI (August) via ROS by 23rd High
- File VAT3 for Jul/Aug period by 23rd High
- File CT1 and pay Corporation Tax balance (Dec year end) by 23rd High
- Final push on Form 11 preparation — October deadline approaching High
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.
October
THE biggest month. Form 11, Preliminary Tax, income tax balance all due 31st.
November
Form 11 ROS extended deadline. VAT3 for September/October. Payroll.
December
CGT payment for Jan–Nov gains due 15th. Payroll. Year-end planning.