Thursday, June 15, 2017

Finance Mythbreaker: Paying off a house in full costs you

Myth: Owning a house saves you money on income tax deductions (True)
         Paying a house in full costs you since you lose an income tax deduction (FALSE)

Assumptions:
I didn’t include a down payment because it’s not going to matter because the interest is only charged on the Outstanding Amount of the Loan every month.

Example:


Outstanding Loan Amount: $300,000 @ 4% on 30yr Fixed
Monthly Payment: $1432 ($432 Principal + $1000 Interest 70% of payment is INTEREST)
Annual Interest Paid: $12,000 due


Annual Household Income: $200,000 @ 28% Marginal Tax Rate = $ 60,568 Income Tax Due
Annual Household Income (After Tax Deduction): $188,000 @ 28% = $ 56,584 to Uncle Sam
Difference between Before and After the House Deduction = $3,984 Savings



Are you willing to pay $12,000 in interest per year to the bank in order to save $3,984 in Tax savings?


 $12,000             $1
-----------   =   ---------       Spend 1$ to save $0.33 cents does not make sense
 $3,984             $0.33


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I used this equation to calculate your monthly mortgage payment:

                r(1+r)^n
M = P -----------------
              (1+r)^n - 1

M is your monthly payment
P is your principal
r is your monthly interest rate, calculated by dividing your annual interest rate by 12
n is your number of payments (the number of payments you will be paying the loan)

Uncle Sam's Thievery plan this year:

Rate
Taxable Income Bracket
Tax Owed
10%
$0 to $18,650
10% of taxable income
15%
$18,650 to $75,900
$1,865 plus 15% of the excess over $18,650
25%
$75,900 to $153,100
$10,452.50 plus 25% of the excess over $75,900
28%
$153,100 to $233,350
$29,752.50 plus 28% of the excess over $153,100
33%
$233,350 to $416,700
$52,222.50 plus 33% of the excess over $233,350