For mortgages, the lenders look at two ratios:
Front-end ratio:
MONTHLY housing expenses (mortgage payment + property taxes + insurance + homeowners association)
---------------divided by----------------
MONTHLY GROSS income
Back-end ratio:
Monthly housing expenses (same as above, again) + all other monthly debt payments including STUDENT LOANS, car loans or leases, credit cards (minimum payment), child support, alimony
---------------divided by----------------
Monthly gross income
For the best deals on mortgages, the front-end ratio should be less than 28% and the back-end ratio should be less than 36%.
So for a pharmacist who GROSSES $120,000 per year, or $10,000 per month, the monthly housing expenses in the front-end ratio should not exceed $2,800 per month.
The total debt payments INCLUDING housing expenses in the back-end ratio should not exceed $3,600 per month. Be aware that if you have high NON-housing expenses, such as a $1,000/mo student loan payment and a $400/mo car payment, these will actually further reduce the allowance for housing expenses like this:
$3,600/mo - $1,000 - $400 = $2,200/mo leftover for housing expenses
So in this example, you will not be allowed the full $2,800/mo housing expenses as calculated in the FRONT-end ratio.
The next step is working out how much $2,200/mo in housing expenses can get you. I would recommend limiting your budget to a 15 year mortgage, rather than 30 year because:
- the 15 yr has a 0.75-1% lower interest rate which will save you $2,400/yr in interest on a $240k mortgage
- on a 4% 30 yr mortgage in the beginning, about 70% of your payment goes towards interest. 30% goes towards principal, so you do not build much equity in the beginning. Thus you could argue that you are not that much better off than renting where you do not have any equity at all. This is particularly true if you have to move and sell your house after only a few years, and you would not have built up much equity on a 30 yr mortgage.
On a 3% 15 yr mortgage in the beginning, about 36% of your payment goes towards interest, 64% to principal, so you build up equity much faster.
A 15 yr mortgage with 3% interest for $240,000 has a monthly payment of $1,657.40. This leaves about $500/mo under the $2,200/mo allowance in the example for property taxes and home insurance, which you will have to work out for your area. Plus a 20% down payment of $60,000 means the total house price is $300,000.
On top of the $60k down payment, you also need closing costs of 3-5%, let's say $15k, and 2-6 months of housing expenses as cash reserves in the bank, say $10k. So altogether you should save up $85k to buy a $300k house.