Budget 2004 Introduction Personal Income Tax Tax Credits National Insurance Contributions Employees Pensioners Savings Trusts Capital Gains Tax Inheritance Tax Stamp Duty / Stamp Duty Land Tax Corporation Tax Business Tax Value Added Tax Other Measures Tax Tables National Insurance	National Insurance Contributions Rates and limits (Table D) The percentage rates of NIC remain unchanged. There are small increases in the thresholds and upper limits, and also in the flat rate weekly payments under Classes 2 and 3.