Help with SA on Property income (as making actual loss)

Hi I'm a bit confused. It seems my SA has risen even when I've made significantly less profit than the previous year on my property. Has something changed? (Rough figures) --- 22/23 PAYE £46000 Property income £4700 Property Expenses etc £1000 SA PAID £800 -----23/24 PAYE £56000 Property income £4700 Property Expenses etc £3000 SA CALCULATION £980 (SA CALCULATION USING LAST YEARS income & expenditure on new PAYE £1500) Does the increase in PAYE income raise my SA that much??? Even considering I have a low mortgage interest rate cost £1000. So this year and any subsequent years I'll be making a loss as mortgage interest is not taken into consideration? HMRC do not take into consideration my actual loss? Are these figures correct and my assumptions correct? Thanks

Hi,
We can only provide general information / guidance in this forum.  
For an answer to a detailed question of this nature, you would need to contact our self assesment helpline on 0300 200 3310, contact our webchat facility at
Contact HMRC or seek professional advice.
Thank you.