Guide to calculation the max mortgage amount
1: Work out your net monthly wage amount
2: Subtract the Net Disposable Income required.
This is €1250 for a single person. €2000 for a couple. €250 add for each child.
[Note: some banks do have different figures but these have been reasonable accurate for both AIB and BOI]
3. Subtract out any loan or credit card payments.
4. Use a mortgage calculator to reverse the payments such as
http://www.drcalculator.com/mortgage/ie/
To do this, tick the box beside the Principal line. Drag the years up to the desired mortgage term. [Note: BOI and AIB usually restrict mortgage terms to finish by the earliest retirement date if two people are applying]
Interest rates are stress tested at the current SVR + 2% or 6%, which ever is higher.
1. ~€2947 Net Income
2. €2947 - €2000 = €947
3. (Taking a wild guess at the repayments for the 2k outstanding) €947 - €100 = €847
4. Using €847 we get a total amount of €141 772
I have assumed a mortgage term of 30 years and the interest rate was 6%
Have a look at
Preparing for a mortgage application too for some suggestions to get your finances in order. You'll need to show some savings in excess of your rent every month.