They usually have a calculator you can bash numbers into if you have an employer code. Or just go to cyclescheme or similar if you don’t know who is doing yours yet.
In simple terms for a £1k bike, as a basic rate taxpayer you save 32% initially and then pay 7% extended hire – overall savings are 25%ish.
As a higher rate (40%) taxpayer you save 42% initially and then pay 7% extended hire – overall savings are 35%ish.
My employer chooses to use an external finance company which adds 11% to the costs of buying a bike through the scheme. Barstewards.
The extended hire is 7% for a bike over £500 and 5% for a bike under it. Which just happens to be the figures HMRC accept for the value of a 4 year old bike. This came in because people were taking the mick and claiming that a 1 year old bike had depreciated from £1000 to £1 when the employee bought the bike from the employer. Heaven forbid the government (of any/all colours) could come up with a simple scheme – maybe just tax free bikes and forget all this capital depreciation stuffs.
Then you get to our incredibly complex tax system so savings may differ from those above. Because it is salary sacrifice, if you are in the effective 60% bracket then you save even more. If you are in the bit where child benefit gets taken off, you get some child benefit back. If you receive tax credits, it counts against them so you have an additional 42% saving.