You are forgetting interest deduction & property tax deduction. so 900k mortgage at 4.1% interest is ~3k of interest and 1.2k of principal for first month. No

You are forgetting interest deduction & property tax deduction. so 900k mortgage at 4.1% interest is ~3k of interest and 1.2k of principal for first month. Now you have 1k/month of property tax, 0 HOA (i was not talking about a condo), and 180$/month of insurance. I've been quoted 80-10-10 which have 0 PMI fees. Let's be safe and assume that you're taxed at 30% at your highest level. Its likely you're being taxed at 40% though. Now doing some math.... 3k*0.7 + 1.2k + 1k+0.7+.180k = 4180$/month. Obviously there's maintenance and other costs but that's how much its actually costing you.