You don’t have to claim the flat rate but the only alternative - without going down the more complex route of renting space to YourCo - is to claim the actual additional costs you incur by working from home.
This means it cannot include any fixed costs that you already pay as they are not wholly, exclusively and necessarily for business purposes. In short, you can claim for the additional utility costs but it’s down to you to calculate the additional costs in a reasonable way and keep evidence of how you calculated in case HMRC queries it.
When you calculate it - say as a percentage of floor space that you use as an office, or by dividing the number of rooms and then adjusting for actual working hours, you might find it doesn’t work out a massive amount more than the flat rate.
I don’t know if the whole “rent a room to your company” approach is still recommended but this is very much a “talk to your accountant” option.
This means it cannot include any fixed costs that you already pay as they are not wholly, exclusively and necessarily for business purposes. In short, you can claim for the additional utility costs but it’s down to you to calculate the additional costs in a reasonable way and keep evidence of how you calculated in case HMRC queries it.
When you calculate it - say as a percentage of floor space that you use as an office, or by dividing the number of rooms and then adjusting for actual working hours, you might find it doesn’t work out a massive amount more than the flat rate.
I don’t know if the whole “rent a room to your company” approach is still recommended but this is very much a “talk to your accountant” option.
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