The Additional State Pension is an extra amount of money you could get with your basic State Pension. It’s based on your National Insurance contributions.
How much you get depends on your earnings and whether you’ve claimed certain benefits. There is no fixed amount like the basic State Pension.
You get the Additional State Pension automatically, unless you’ve contracted out of it.
The Additional State Pension is paid with your basic State Pension. It normally increases every year by prices - the percentage growth in prices in the UK as measured by the Consumer Prices Index (CPI).