Help figuring out CGT

[paperclip]

Bought an investment property with a friend 13 years ago. Was my primary residence for 5 years.
I believe the last 12 months can be written off, even if you're not living there.
So, liable for 7 years. How do I calculate that?

Can I write off the following,
Purchase fees, solicitor etc
Maintenance (need receipts?)
Sales fees, agent, solicitor

Anything else I'm missing?

For maintenance, biggest cost was boiler, 4k... But that was 8 years ago, so receipt long gone.

Thanks.

 

[jpd]

Net sale price = Sale price less selling costs
Cost = Purchase price plus purchasing expenses
Capital gain = Net sale price less Cost
Your share = gain by whatever % you own
Period of ownership = 13 years
PPR = 5 years
Relief for PPR = (5+1)/13 = 46%
Chargeable Capital Gain = your share x 54%
Tax = Chargeable gain x 33%