Year by year reductions have been announced in the corporation tax rates as follows:
| Year from 1 April | Standard rate | Small companies rate | Marginal rate |
| 2010 (current rates) | 28% | 21% | 29.75% |
| 2011 | 27% | 20% | 28.75% |
| 2012 | 26% | 20% | 27.5% |
| 2013 | 25% | 20% | 26.25% |
| 2014 | 24% | 20% | 25% |
The reduction in the tax rate will have various practical effects. It will:
There will be implications for companies’ financial statements. The change to the tax rate will impact the accounting value of deferred tax assets and liabilities, and the amount of the deferred tax will have to be revised every time a reduction in the tax rate is substantively enacted.