USC 7% or 4% on rental income

I rent a out a house which has a mortgage on it.

In calculating the USC, should I be using 45 or 7% and does the rate apply from 2014?

I'm in full time work earning approx 50k. My partenr works part time earning approx 45k.

We rent the house we live in.

Thanks

Meant 4% or 7%

On your current level of earnings, I believe USC will be calculated at 7% on the additional rental income.

Ok, thanks.