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Illustrative Financial Modelling • Not Regulated Advice

Mortgage Overpayment Calculator

For illustrative purposes only — not financial advice. About our calculators

Mortgage Configuration

REPAYMENT DETAILS
%
Years

Optimisation Strategy

Even a small monthly overpayment can shave years off your term and potentially save thousands in interest.

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Mortgage Summary Results

Monthly Payment

£1,535

Interest Cost

£210,566

Total Repayable

£460,566

Mortgage WarningYour home may be repossessed if you do not keep up repayments on your mortgage.
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Detailed Amortisation Schedule Table

Amortisation Schedule
300 Total Payments
MonthPaymentPrincipalInterestBalance
#1£1,535.22£389.39£1,145.83£249,610.61
#2£1,535.22£391.17£1,144.05£249,219.44
#3£1,535.22£392.96£1,142.26£248,826.48
#4£1,535.22£394.76£1,140.45£248,431.72
#5£1,535.22£396.57£1,138.65£248,035.14
#6£1,535.22£398.39£1,136.83£247,636.75
#7£1,535.22£400.22£1,135.00£247,236.54
#8£1,535.22£402.05£1,133.17£246,834.48
#9£1,535.22£403.89£1,131.32£246,430.59
#10£1,535.22£405.75£1,129.47£246,024.85
#11£1,535.22£407.60£1,127.61£245,617.24
#12£1,535.22£409.47£1,125.75£245,207.77
#13£1,535.22£411.35£1,123.87£244,796.42
#14£1,535.22£413.24£1,121.98£244,383.18
#15£1,535.22£415.13£1,120.09£243,968.05
#16£1,535.22£417.03£1,118.19£243,551.02
#17£1,535.22£418.94£1,116.28£243,132.08
#18£1,535.22£420.86£1,114.36£242,711.22
#19£1,535.22£422.79£1,112.43£242,288.42
#20£1,535.22£424.73£1,110.49£241,863.69
#21£1,535.22£426.68£1,108.54£241,437.02
#22£1,535.22£428.63£1,106.59£241,008.38
#23£1,535.22£430.60£1,104.62£240,577.79
#24£1,535.22£432.57£1,102.65£240,145.22
#25£1,535.22£434.55£1,100.67£239,710.66
#26£1,535.22£436.54£1,098.67£239,274.12
#27£1,535.22£438.55£1,096.67£238,835.57
#28£1,535.22£440.56£1,094.66£238,395.02
#29£1,535.22£442.57£1,092.64£237,952.44
#30£1,535.22£444.60£1,090.62£237,507.84
#31£1,535.22£446.64£1,088.58£237,061.20
#32£1,535.22£448.69£1,086.53£236,612.51
#33£1,535.22£450.74£1,084.47£236,161.76
#34£1,535.22£452.81£1,082.41£235,708.95
#35£1,535.22£454.89£1,080.33£235,254.07
#36£1,535.22£456.97£1,078.25£234,797.10
#37£1,535.22£459.07£1,076.15£234,338.03
#38£1,535.22£461.17£1,074.05£233,876.86
#39£1,535.22£463.28£1,071.94£233,413.58
#40£1,535.22£465.41£1,069.81£232,948.17
#41£1,535.22£467.54£1,067.68£232,480.63
#42£1,535.22£469.68£1,065.54£232,010.95
#43£1,535.22£471.84£1,063.38£231,539.12
#44£1,535.22£474.00£1,061.22£231,065.12
#45£1,535.22£476.17£1,059.05£230,588.95
#46£1,535.22£478.35£1,056.87£230,110.59
#47£1,535.22£480.55£1,054.67£229,630.05
#48£1,535.22£482.75£1,052.47£229,147.30
#49£1,535.22£484.96£1,050.26£228,662.34
#50£1,535.22£487.18£1,048.04£228,175.16
#51£1,535.22£489.42£1,045.80£227,685.74
#52£1,535.22£491.66£1,043.56£227,194.08
#53£1,535.22£493.91£1,041.31£226,700.17
#54£1,535.22£496.18£1,039.04£226,203.99
#55£1,535.22£498.45£1,036.77£225,705.54
#56£1,535.22£500.73£1,034.48£225,204.81
#57£1,535.22£503.03£1,032.19£224,701.78
#58£1,535.22£505.34£1,029.88£224,196.44
#59£1,535.22£507.65£1,027.57£223,688.79
#60£1,535.22£509.98£1,025.24£223,178.81
#61£1,535.22£512.32£1,022.90£222,666.50
#62£1,535.22£514.66£1,020.55£222,151.83
#63£1,535.22£517.02£1,018.20£221,634.81
#64£1,535.22£519.39£1,015.83£221,115.42
#65£1,535.22£521.77£1,013.45£220,593.65
#66£1,535.22£524.16£1,011.05£220,069.48
#67£1,535.22£526.57£1,008.65£219,542.91
#68£1,535.22£528.98£1,006.24£219,013.93
#69£1,535.22£531.40£1,003.81£218,482.53
#70£1,535.22£533.84£1,001.38£217,948.69
#71£1,535.22£536.29£998.93£217,412.40
#72£1,535.22£538.75£996.47£216,873.66
#73£1,535.22£541.21£994.00£216,332.44
#74£1,535.22£543.70£991.52£215,788.75
#75£1,535.22£546.19£989.03£215,242.56
#76£1,535.22£548.69£986.53£214,693.87
#77£1,535.22£551.21£984.01£214,142.66
#78£1,535.22£553.73£981.49£213,588.93
#79£1,535.22£556.27£978.95£213,032.66
#80£1,535.22£558.82£976.40£212,473.84
#81£1,535.22£561.38£973.84£211,912.46
#82£1,535.22£563.95£971.27£211,348.51
#83£1,535.22£566.54£968.68£210,781.97
#84£1,535.22£569.13£966.08£210,212.84
#85£1,535.22£571.74£963.48£209,641.09
#86£1,535.22£574.36£960.86£209,066.73
#87£1,535.22£577.00£958.22£208,489.73
#88£1,535.22£579.64£955.58£207,910.09
#89£1,535.22£582.30£952.92£207,327.80
#90£1,535.22£584.97£950.25£206,742.83
#91£1,535.22£587.65£947.57£206,155.18
#92£1,535.22£590.34£944.88£205,564.84
#93£1,535.22£593.05£942.17£204,971.79
#94£1,535.22£595.76£939.45£204,376.03
#95£1,535.22£598.50£936.72£203,777.53
#96£1,535.22£601.24£933.98£203,176.30
#97£1,535.22£603.99£931.22£202,572.30
#98£1,535.22£606.76£928.46£201,965.54
#99£1,535.22£609.54£925.68£201,356.00
#100£1,535.22£612.34£922.88£200,743.66
#101£1,535.22£615.14£920.08£200,128.52
#102£1,535.22£617.96£917.26£199,510.55
#103£1,535.22£620.80£914.42£198,889.76
#104£1,535.22£623.64£911.58£198,266.12
#105£1,535.22£626.50£908.72£197,639.62
#106£1,535.22£629.37£905.85£197,010.25
#107£1,535.22£632.26£902.96£196,377.99
#108£1,535.22£635.15£900.07£195,742.84
#109£1,535.22£638.06£897.15£195,104.78
#110£1,535.22£640.99£894.23£194,463.79
#111£1,535.22£643.93£891.29£193,819.86
#112£1,535.22£646.88£888.34£193,172.98
#113£1,535.22£649.84£885.38£192,523.14
#114£1,535.22£652.82£882.40£191,870.32
#115£1,535.22£655.81£879.41£191,214.51
#116£1,535.22£658.82£876.40£190,555.69
#117£1,535.22£661.84£873.38£189,893.85
#118£1,535.22£664.87£870.35£189,228.98
#119£1,535.22£667.92£867.30£188,561.06
#120£1,535.22£670.98£864.24£187,890.08
#121£1,535.22£674.06£861.16£187,216.02
#122£1,535.22£677.15£858.07£186,538.88
#123£1,535.22£680.25£854.97£185,858.63
#124£1,535.22£683.37£851.85£185,175.26
#125£1,535.22£686.50£848.72£184,488.76
#126£1,535.22£689.65£845.57£183,799.12
#127£1,535.22£692.81£842.41£183,106.31
#128£1,535.22£695.98£839.24£182,410.33
#129£1,535.22£699.17£836.05£181,711.16
#130£1,535.22£702.38£832.84£181,008.78
#131£1,535.22£705.60£829.62£180,303.19
#132£1,535.22£708.83£826.39£179,594.36
#133£1,535.22£712.08£823.14£178,882.28
#134£1,535.22£715.34£819.88£178,166.94
#135£1,535.22£718.62£816.60£177,448.32
#136£1,535.22£721.91£813.30£176,726.40
#137£1,535.22£725.22£810.00£176,001.18
#138£1,535.22£728.55£806.67£175,272.63
#139£1,535.22£731.89£803.33£174,540.75
#140£1,535.22£735.24£799.98£173,805.51
#141£1,535.22£738.61£796.61£173,066.90
#142£1,535.22£742.00£793.22£172,324.90
#143£1,535.22£745.40£789.82£171,579.51
#144£1,535.22£748.81£786.41£170,830.69
#145£1,535.22£752.24£782.97£170,078.45
#146£1,535.22£755.69£779.53£169,322.76
#147£1,535.22£759.16£776.06£168,563.60
#148£1,535.22£762.64£772.58£167,800.96
#149£1,535.22£766.13£769.09£167,034.83
#150£1,535.22£769.64£765.58£166,265.19
#151£1,535.22£773.17£762.05£165,492.02
#152£1,535.22£776.71£758.51£164,715.31
#153£1,535.22£780.27£754.95£163,935.03
#154£1,535.22£783.85£751.37£163,151.18
#155£1,535.22£787.44£747.78£162,363.74
#156£1,535.22£791.05£744.17£161,572.69
#157£1,535.22£794.68£740.54£160,778.01
#158£1,535.22£798.32£736.90£159,979.69
#159£1,535.22£801.98£733.24£159,177.71
#160£1,535.22£805.65£729.56£158,372.06
#161£1,535.22£809.35£725.87£157,562.71
#162£1,535.22£813.06£722.16£156,749.66
#163£1,535.22£816.78£718.44£155,932.87
#164£1,535.22£820.53£714.69£155,112.35
#165£1,535.22£824.29£710.93£154,288.06
#166£1,535.22£828.07£707.15£153,460.00
#167£1,535.22£831.86£703.36£152,628.14
#168£1,535.22£835.67£699.55£151,792.46
#169£1,535.22£839.50£695.72£150,952.96
#170£1,535.22£843.35£691.87£150,109.61
#171£1,535.22£847.22£688.00£149,262.39
#172£1,535.22£851.10£684.12£148,411.29
#173£1,535.22£855.00£680.22£147,556.29
#174£1,535.22£858.92£676.30£146,697.37
#175£1,535.22£862.86£672.36£145,834.52
#176£1,535.22£866.81£668.41£144,967.71
#177£1,535.22£870.78£664.44£144,096.92
#178£1,535.22£874.77£660.44£143,222.15
#179£1,535.22£878.78£656.43£142,343.36
#180£1,535.22£882.81£652.41£141,460.55
#181£1,535.22£886.86£648.36£140,573.70
#182£1,535.22£890.92£644.30£139,682.77
#183£1,535.22£895.01£640.21£138,787.77
#184£1,535.22£899.11£636.11£137,888.66
#185£1,535.22£903.23£631.99£136,985.43
#186£1,535.22£907.37£627.85£136,078.06
#187£1,535.22£911.53£623.69£135,166.53
#188£1,535.22£915.71£619.51£134,250.83
#189£1,535.22£919.90£615.32£133,330.93
#190£1,535.22£924.12£611.10£132,406.81
#191£1,535.22£928.35£606.86£131,478.45
#192£1,535.22£932.61£602.61£130,545.84
#193£1,535.22£936.88£598.34£129,608.96
#194£1,535.22£941.18£594.04£128,667.78
#195£1,535.22£945.49£589.73£127,722.29
#196£1,535.22£949.82£585.39£126,772.47
#197£1,535.22£954.18£581.04£125,818.29
#198£1,535.22£958.55£576.67£124,859.74
#199£1,535.22£962.94£572.27£123,896.79
#200£1,535.22£967.36£567.86£122,929.43
#201£1,535.22£971.79£563.43£121,957.64
#202£1,535.22£976.25£558.97£120,981.39
#203£1,535.22£980.72£554.50£120,000.67
#204£1,535.22£985.22£550.00£119,015.46
#205£1,535.22£989.73£545.49£118,025.73
#206£1,535.22£994.27£540.95£117,031.46
#207£1,535.22£998.82£536.39£116,032.63
#208£1,535.22£1,003.40£531.82£115,029.23
#209£1,535.22£1,008.00£527.22£114,021.23
#210£1,535.22£1,012.62£522.60£113,008.61
#211£1,535.22£1,017.26£517.96£111,991.35
#212£1,535.22£1,021.93£513.29£110,969.42
#213£1,535.22£1,026.61£508.61£109,942.81
#214£1,535.22£1,031.31£503.90£108,911.50
#215£1,535.22£1,036.04£499.18£107,875.46
#216£1,535.22£1,040.79£494.43£106,834.67
#217£1,535.22£1,045.56£489.66£105,789.11
#218£1,535.22£1,050.35£484.87£104,738.76
#219£1,535.22£1,055.17£480.05£103,683.59
#220£1,535.22£1,060.00£475.22£102,623.59
#221£1,535.22£1,064.86£470.36£101,558.73
#222£1,535.22£1,069.74£465.48£100,488.99
#223£1,535.22£1,074.64£460.57£99,414.34
#224£1,535.22£1,079.57£455.65£98,334.77
#225£1,535.22£1,084.52£450.70£97,250.25
#226£1,535.22£1,089.49£445.73£96,160.77
#227£1,535.22£1,094.48£440.74£95,066.28
#228£1,535.22£1,099.50£435.72£93,966.79
#229£1,535.22£1,104.54£430.68£92,862.25
#230£1,535.22£1,109.60£425.62£91,752.65
#231£1,535.22£1,114.69£420.53£90,637.96
#232£1,535.22£1,119.79£415.42£89,518.17
#233£1,535.22£1,124.93£410.29£88,393.24
#234£1,535.22£1,130.08£405.14£87,263.16
#235£1,535.22£1,135.26£399.96£86,127.89
#236£1,535.22£1,140.47£394.75£84,987.43
#237£1,535.22£1,145.69£389.53£83,841.74
#238£1,535.22£1,150.94£384.27£82,690.79
#239£1,535.22£1,156.22£379.00£81,534.57
#240£1,535.22£1,161.52£373.70£80,373.05
#241£1,535.22£1,166.84£368.38£79,206.21
#242£1,535.22£1,172.19£363.03£78,034.02
#243£1,535.22£1,177.56£357.66£76,856.46
#244£1,535.22£1,182.96£352.26£75,673.50
#245£1,535.22£1,188.38£346.84£74,485.12
#246£1,535.22£1,193.83£341.39£73,291.29
#247£1,535.22£1,199.30£335.92£72,091.99
#248£1,535.22£1,204.80£330.42£70,887.19
#249£1,535.22£1,210.32£324.90£69,676.87
#250£1,535.22£1,215.87£319.35£68,461.00
#251£1,535.22£1,221.44£313.78£67,239.57
#252£1,535.22£1,227.04£308.18£66,012.53
#253£1,535.22£1,232.66£302.56£64,779.87
#254£1,535.22£1,238.31£296.91£63,541.56
#255£1,535.22£1,243.99£291.23£62,297.57
#256£1,535.22£1,249.69£285.53£61,047.88
#257£1,535.22£1,255.42£279.80£59,792.47
#258£1,535.22£1,261.17£274.05£58,531.30
#259£1,535.22£1,266.95£268.27£57,264.35
#260£1,535.22£1,272.76£262.46£55,991.59
#261£1,535.22£1,278.59£256.63£54,713.00
#262£1,535.22£1,284.45£250.77£53,428.55
#263£1,535.22£1,290.34£244.88£52,138.21
#264£1,535.22£1,296.25£238.97£50,841.96
#265£1,535.22£1,302.19£233.03£49,539.76
#266£1,535.22£1,308.16£227.06£48,231.60
#267£1,535.22£1,314.16£221.06£46,917.44
#268£1,535.22£1,320.18£215.04£45,597.26
#269£1,535.22£1,326.23£208.99£44,271.03
#270£1,535.22£1,332.31£202.91£42,938.72
#271£1,535.22£1,338.42£196.80£41,600.31
#272£1,535.22£1,344.55£190.67£40,255.76
#273£1,535.22£1,350.71£184.51£38,905.04
#274£1,535.22£1,356.90£178.31£37,548.14
#275£1,535.22£1,363.12£172.10£36,185.02
#276£1,535.22£1,369.37£165.85£34,815.65
#277£1,535.22£1,375.65£159.57£33,440.00
#278£1,535.22£1,381.95£153.27£32,058.05
#279£1,535.22£1,388.29£146.93£30,669.76
#280£1,535.22£1,394.65£140.57£29,275.11
#281£1,535.22£1,401.04£134.18£27,874.07
#282£1,535.22£1,407.46£127.76£26,466.61
#283£1,535.22£1,413.91£121.31£25,052.69
#284£1,535.22£1,420.39£114.82£23,632.30
#285£1,535.22£1,426.90£108.31£22,205.40
#286£1,535.22£1,433.44£101.77£20,771.95
#287£1,535.22£1,440.01£95.20£19,331.94
#288£1,535.22£1,446.61£88.60£17,885.32
#289£1,535.22£1,453.24£81.97£16,432.08
#290£1,535.22£1,459.91£75.31£14,972.17
#291£1,535.22£1,466.60£68.62£13,505.58
#292£1,535.22£1,473.32£61.90£12,032.26
#293£1,535.22£1,480.07£55.15£10,552.19
#294£1,535.22£1,486.85£48.36£9,065.34
#295£1,535.22£1,493.67£41.55£7,571.67
#296£1,535.22£1,500.52£34.70£6,071.15
#297£1,535.22£1,507.39£27.83£4,563.76
#298£1,535.22£1,514.30£20.92£3,049.46
#299£1,535.22£1,521.24£13.98£1,528.21
#300£1,535.22£1,528.21£7.00£0.00

Mastering Your Mortgage Overpayments

Amortisation Mathematics & Principal Reduction

A mortgage is a long-term amortising loan, calculated using the standard formula: M = P * [r(1+r)^n] / [(1+r)^n - 1]. In the early years of a 25 or 30-year term, the vast majority of your monthly payment is allocated toward servicing the interest, with very little reducing the actual principal balance. This occurs because interest is charged on the outstanding balance. Making voluntary overpayments bypasses the interest charging phase completely; 100% of your overpayment goes directly toward reducing the principal balance. This permanently lowers the base on which future interest is calculated, triggering a powerful compounding effect that saves thousands in interest and shaves years off your mortgage duration.

Fixed vs. Variable Rate Mechanics

Before embarking on an overpayment strategy, it is critical to understand the terms of your mortgage. Fixed-rate mortgages typically enforce an annual overpayment limit (usually 10% of the outstanding balance at the start of the year or anniversary). Exceeding this limit triggers Early Repayment Charges (ERCs), which are percentage-based penalties (often 1% to 5%) that can easily wipe out any interest savings. Conversely, standard variable rate (SVR) or tracker mortgages usually permit unlimited overpayments without penalty. Always consult your mortgage offer or contact your lender to confirm your exact allowance.

Loan-to-Value (LTV) & Remortgaging Leverage

Reducing your outstanding loan balance does more than just save interest on your current rate; it directly lowers your Loan-to-Value (LTV) ratio. LTV is the percentage of the property's value that is mortgaged. Lenders price their products in tiers (typically at 90%, 80%, 75%, and 60% LTV). By overpaying and aggressively dropping into a lower LTV bracket, you qualify for significantly cheaper interest rates when your fixed term ends and it is time to refinance. This secondary benefit of overpaying can often yield even greater long-term savings than the direct interest saved during the term.

Term Reduction vs. Monthly Payment Reduction

Lenders typically offer two choices when you overpay: reduce the remaining mortgage term (keeping your monthly payments the same) or reduce your monthly payment amount (keeping the original term end date). If your primary goal is to minimise total lifetime interest paid, term reduction is mathematically superior. However, choosing to reduce your monthly payment lowers your ongoing monthly commitment, which enhances your monthly cash flow and provides a valuable financial safety net. You can model both options using REPAYLY to decide which strategy aligns with your personal risk tolerance.

Financial Literacy Hub

Managing debt effectively requires more than just a calculator. It requires a strategy. Whether you're using the Snowball Method (paying off small debts first for momentum) or the Avalanche Method (targeting high-interest debt first), REPAYLY provides the data you need to stay on track.

Expert Tip

Always verify early repayment terms with your lender before making large lump-sum payments.

Key Concept

Overpayments reduce your principal balance directly, compounding your savings every month.

Note: This tool is designed for illustrative modelling purposes only. While we use standard amortisation formulas, your specific lender may use slightly different daily interest calculations. We recommend checking your latest statement or contacting your lender for precise figures.
UK Mortgage Overpayment Calculator & Amortisation Tool | REPAYLY