def main():
## Calculate the monthly payment for a mortgage.
principal = float(input("Enter principal of mortgage: "))
interestRate = float(input("Enter percent interest rate: "))
term = float(input("Enter duration of mortgage in years: "))
mort = mortgage.Mortgage(principal, interestRate, term)
print("Monthly payment: ${0:,.2f}".format(mort.calculateMonthlyPayment()))
def get_monthly_mortgage(self, interest, amount, months, property_tax_rate): try: amount = int(amount) m = mortgage.Mortgage(interest=interest, amount=amount, months=months) base_monthly_payment = m.monthly_payment() insurance = amount/1000*3.5/12 taxes = amount * property_tax_rate / 12 monthly_payment = base_monthly_payment + insurance + taxes self.monthly_mortgage = monthly_payment except: pass
def __init__(self, price, down_percent, interest, years, closing, taxes, appreciation, insurance, selling_cost, rent, value):
self._price = float(price)
self._down = float(price*down_percent)
self._closing = float(closing)
self._taxes = float(taxes/12)
self._appreciation = float(appreciation)/12.0
self._rent = rent
self._mortgage = mortgage.Mortgage(interest, years, price-self._down)
self._current_value = float(value)
self._tax_appraisal = float(value)
self._insurance = float(insurance/12)
self._selling_cost = selling_cost
self._sell_profit = 0
self._equity = self._down
def financing_assumptions(equity_per, seller_carry_per, interest_rate,
amort_period, seller_carry_rate, seller_carry_term):
global m, total_purchase, ask, improvements_cost, owners_equity_percent, seller_financing_percent, owners_equity_value, seller_financing_value, financing_amount, interest_rate_yearly, interest_rate_monthly, amort_period_yearly, amort_period_monthly, payment_monthly, payment_annual, seller_financing_rate, seller_financing_term
total_purchase = ask - improvements_cost
owners_equity_percent = equity_per
seller_financing_percent = seller_carry_per
owners_equity_value = total_purchase * owners_equity_percent
seller_financing_value = total_purchase * seller_carry_per
financing_amount = total_purchase - (owners_equity_value +
seller_financing_value)
interest_rate_yearly = interest_rate
interest_rate_monthly = interest_rate_yearly / 12
amort_period_yearly = amort_period
amort_period_monthly = amort_period_yearly * 12
m = mortgage.Mortgage(interest=(interest_rate_yearly / 100),
amount=financing_amount,
months=amort_period_monthly)
payment_monthly = m.monthly_payment()
payment_annual = payment_monthly * 12
seller_financing_rate = seller_carry_rate
seller_financing_term = seller_carry_term
def main():
principal = eval(input("Enter principal of mortgage: "))
interestRate = eval(input("Enter percent interest rate: "))
term = eval(input("Enter duration of mortgage in years: "))
ans = mortgage.Mortgage(principal, interestRate, term)
print("Monthly payment: ${0:,.2f}".format(ans.calculateMonthlyPayment()))
def rentVsBuy(purchase_price, down_decimal, years, interest, closing, selling_cost,\
tax, appreciation, insurance, market_gains, current_rent, rental_increase, deposit,\
rental_income, upfront_repair, value, plot, rental_stop):
if value == 0:
value = purchase_price
months = years * 12
market_gains_p = 1 + market_gains / 12
down = purchase_price * down_decimal
principle = purchase_price - down
m = mortgage.Mortgage(interest, years, principle)
payment = m.monthlyPayment()
print("down: $", down, "\tdown+repair+closing: ",
down + upfront_repair + closing * purchase_price)
print("monthly mortgage payment: $", payment, "total monthly: $ ", \
round(payment+(insurance+tax)*purchase_price/12.0,2), "cost to us: ",\
round(payment+(insurance+tax)*purchase_price/12.0 - rental_income,2 ))
#print("total paid on mortgage: $", round(m.totalPaid(),2), "total paid: $", \
# round(down+m.totalPaid(),2))
#print("amotorization schedule")
# for month in range(0,months):
# principle, i_pmt, p_pmt = m.update(payment)
# print("month: ", month, "\t principle: ", principle, "\ti_pmt: ", i_pmt, "\tp_pmt: ", p_pmt)
house_rental = rent.Rent(rental_income, 0)
b = buy.Buy(purchase_price, down_decimal, interest, years, closing, tax, appreciation,\
insurance,selling_cost,house_rental,value)
r = rent.Rent(current_rent, deposit)
costs = []
#One time costs:
rental = r.deposit()
purchase = closing * purchase_price + down + upfront_repair
b_opp_cost = purchase
r_opp_cost = rental
opp_cost_after_sale = purchase_price * (selling_cost + closing)
costs.append(
[rental, r_opp_cost, purchase, b_opp_cost, opp_cost_after_sale])
flag = [1, 1, 1, 1]
for month in range(1, months):
if month % 12 == 0:
#print("year end results:", costs[-1])
r.increase(rental_increase)
b.taxAppraisal()
b._rent.increase(rental_increase)
r_cost = r.update()
b_cost, b_sell = b.update(
b.monthlyPayment()) #includes rental if applicable
rental += r_cost
purchase += b_cost
b_opp_cost = b_opp_cost * market_gains_p + b_cost
r_opp_cost = r_opp_cost * market_gains_p + r_cost
opp_cost_after_sale = b_opp_cost - b_sell
costs.append(
[rental, r_opp_cost, purchase, b_opp_cost, opp_cost_after_sale])
if month == 60:
print("year 5, sale: $", round(opp_cost_after_sale), "rent: $", round(r_opp_cost),\
"diff: $", round(opp_cost_after_sale-r_opp_cost))
if rental_stop:
b._rent._rent += r._rent
print("rent income increasing at year 5 to: ",
round(b._rent._rent))
if rental > purchase and flag[0]:
#print("straight costs crossing at month: ", month, month/12.)
flag[0] = 0
if r_opp_cost > b_opp_cost and flag[1]:
print("buying is better w/o sale of property after month: ",
month, "years: ", round(month / 12., 2))
flag[1] = 0
if r_opp_cost > opp_cost_after_sale and flag[2]:
print("buying is better with sale of property after month: ",
month, "year: ", round(month / 12., 2))
flag[2] = 0
if 0 > opp_cost_after_sale and flag[3]:
#print("reselling makes a profit after: ", month, month/12.)
flag[3] = 0
#print("monthly cost for last payment year 30: ", b_cost)
#plots
purchase_costs = [c[2] for c in costs]
purchase_opp_costs = [c[3] for c in costs]
resale_opp_costs = [c[4] for c in costs]
rent_costs = [c[0] for c in costs]
rent_opp_costs = [c[1] for c in costs]
if 0:
fig, ax = plt.subplots(2, 1)
ax[0].plot(range(0, months), purchase_costs, label='purchase costs')
ax[0].plot(range(0, months), rent_costs, label='rent costs')
ax[1].plot(range(0, months),
purchase_opp_costs,
label='purchase opp costs')
ax[1].plot(range(0, months),
resale_opp_costs,
label='resale opp costs')
ax[1].plot(range(0, months), rent_opp_costs, label='rent costs')
ax[0].legend()
ax[1].legend()
plt.show()
if plot:
fig, ax = plt.subplots()
ax.plot(range(0, months),
purchase_opp_costs,
label='purchase opp costs')
ax.plot(range(0, months), resale_opp_costs, label='resale opp costs')
ax.plot(range(0, months), rent_opp_costs, label='rent costs')
title = "purchase_price:"+str(purchase_price)+"; rent: "+str(current_rent)+\
"; renter: "+str(rental_income)
ax.set_title(title)
ax.set_xlabel('months')
ax.set_ylabel('$')
ax.legend()
plt.show()