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DebtLOC Payoff Simulator

The honest simulator for HELOC / velocity banking strategies. Shows you when it actually helps, when it doesn't, and how small the real benefit typically is vs simple extra payments. Free verdict, premium depth.

Debt Type
Original Loan Amount$350,000

The original mortgage loan amount

Interest Rate6.5%

Your mortgage annual interest rate

Loan Term30 yrs
Years Already Paid5 yrs

How many years you've been paying this mortgage

Remaining Balance: $327,638
Monthly Payment (P&I): $2,212
Remaining Term: 25 yrs
Escrow (taxes & insurance) is not included — it doesn't reduce your debt. Your monthly surplus should already account for escrow.
Line of Credit
LOC Credit Limit$50,000

Maximum amount available on your line of credit

LOC Interest Rate7.5%

Annual interest rate on the line of credit

Monthly Income Surplus$1,000

Your income minus all expenses — the cash available to pay down the LOC each month

Extra Monthly Payment$500

Additional amount paid toward debt principal each month (the direct-extra-payment benchmark)

Upgrade for Advanced OptionsChunk size · sensitivity · multi-debt · month-by-month →
Equity at risk
$49,246
Peak HELOC draw. That much home equity is on the hook during the payoff. A default on this line means foreclosure risk, not just a credit hit.
If HELOC rate rises +2%
+$15,960
Extra interest at 9.5% HELOC vs current 7.5%. HELOCs are variable — your rate can and usually does move.
Invest the surplus instead
$810,072
$1,000/mo at 7% for 25 years — larger than the LOC's interest savings over direct payments ($47,660).
Your HELOC rate (7.5%) is 1.0 percentage point higher than your mortgage rate (6.5%). The strategy only wins when the HELOC's average daily balance stays low enough that the rate premium is offset by faster principal paydown on the higher-interest debt.
Payoff Timeline
Standard25y
Extra Payments16y 5mo
LOC Acceleration12y 7mo
Total Interest
Standard$336,033
Extra Payments$205,709
LOC Acceleration$158,049
LOC: $121,649 debt + $36,400 LOC
Interest Saved
$177,984
vs standard ($130,324 with extra payments alone)
Payoff Race
$0$89K$177K$266K$354K1611162125
StandardExtra PaymentsLOC Acceleration
Payoff Race
PeriodStandardExtra PaymentsLOC Acceleration
1$322K$316K$310K
2$316K$304K$292K
3$310K$290K$272K
4$304K$276K$251K
5$297K$261K$228K
6$289K$245K$204K
7$281K$228K$179K
8$273K$210K$151K
9$264K$191K$122K
10$254K$170K$91K
11$244K$148K$58K
12$233K$124K$21K
13$221K$99K$0
14$208K$72K$0
15$195K$43K$0
16$181K$12K$0
17$165K$0$0
18$149K$0$0
19$132K$0$0
20$113K$0$0
21$93K$0$0
22$72K$0$0
23$50K$0$0
24$26K$0$0
25$0$0$0
Year-by-Year Breakdown (LOC Strategy)
PrincipalDebt InterestLOC Interest
1
$280K$21,132
2
$250K$41,212
3
$239K$59,981
4
$207K$77,467
5
$193K$93,523
6
$159K$108,062
7
$142K$121,024
8
$104K$132,229
9
$83K$141,668
10
$61K$149,064
11
$17K$154,489
12
$0$157,545
13
$0$158,049
Year-by-Year Breakdown (LOC Strategy)
LabelPrincipalDebt InterestLOC Interest
17,97418,5732,558
29,84716,7003,380
310,62115,9252,843
412,21614,3313,156
513,49013,0572,999
614,94111,6052,933
716,7349,8133,150
818,1818,3662,839
920,4126,1353,305
1021,7794,7682,627
1124,5771,9703,455
1216,8674062,650
1300504
Strategy Verdict
LOC acceleration pays off your debt 12 years 5 months earlier than standard payments and saves $177,984 in interest. Simple extra payments would save $130,324 — the LOC strategy saves an additional $47,660.
Want the full picture?

You just got the verdict. Premium unlocks the depth:

  • · Chunk-size optimization (what chunk beats simple extra payments by the most)
  • · Multi-debt + avalanche/snowball payoff order
  • · Variable-rate schedule builder (what if HELOC rate changes year over year)
  • · Configurable opportunity-cost return
  • · Full break-even rate + month-by-month schedule
See Premium pricing →
For informational purposes only. LOC acceleration results depend on your actual LOC terms, spending habits, and cash flow. Consult a financial advisor before restructuring debt. Interest calculations use monthly compounding for installment debts and daily compounding for the line of credit.