Principal

Principal is the original loan amount you borrow from a lender, excluding interest and fees. When you make repayments, a portion goes toward reducing the principal (except with interest-only loans). Lower principal = less interest paid over the loan term.

Understanding Principal vs Interest

The Loan Breakdown

Every loan has two components:

Principal:

• The original amount borrowed
• Example: Borrow $600,000 for a home
• Principal = $600,000

Interest:

• The cost of borrowing that principal
• Calculated as a percentage of remaining principal
• Example: 6.0% p.a. on $600,000 = $36,000/year interest

Total amount repaid:

• Principal: $600,000
• Interest (over 30 years): $491,580
• Total: $1,091,580

How Repayments Split Between Principal and Interest

Example: $600,000 loan at 6.0% p.a., 30-year term

First repayment ($3,597/month):

• Interest: $3,000 (6.0% ÷ 12 × $600,000)
• Principal: $597
• Remaining principal: $599,403

Repayment #60 (5 years in):

• Interest: $2,760
• Principal: $837
• Remaining principal: $555,280

Repayment #180 (15 years in):

• Interest: $2,097
• Principal: $1,500
• Remaining principal: $419,600

Repayment #300 (25 years in):

• Interest: $969
• Principal: $2,628
• Remaining principal: $193,800

Final repayment:

• Interest: $18
• Principal: $3,579
• Remaining principal: $0

Key insight: Early repayments are mostly interest. Later repayments are mostly principal.

Principal in Different Loan Types

Home Loans

Typical principal amounts:

• Sydney/Melbourne: $700,000-$1,200,000
• Brisbane/Perth: $500,000-$800,000
• Regional areas: $350,000-$600,000

Example:

• Property price: $850,000
• Deposit (10%): $85,000
• Principal borrowed: $765,000
• Plus LMI: $25,000
• Total principal: $790,000

Car Loans

Typical principal amounts:

• New cars: $40,000-$80,000
• Used cars: $15,000-$40,000
• Luxury vehicles: $80,000-$150,000

Example:

• Car price: $65,000
• Deposit: $10,000
• Trade-in: $5,000
• Principal borrowed: $50,000

Personal Loans

Typical principal amounts:

• Debt consolidation: $20,000-$50,000
• Home renovations: $15,000-$60,000
• Medical expenses: $5,000-$30,000

Example:

• Credit card debt: $18,000 (at 20% p.a.)
• Personal loan debt: $12,000 (at 15% p.a.)
• Consolidation loan: $30,000 (at 9.5% p.a.)
• New principal: $30,000 (at much lower rate)

How Extra Repayments Reduce Principal

The Power of Principal Reduction

Example: $600,000 loan at 6.0% p.a., 30 years

Scenario A: Minimum repayments only

• Monthly repayment: $3,597
• Total interest paid: $491,580
• Loan term: 30 years (360 months)

Scenario B: Extra $500/month

• Monthly repayment: $4,097
• Total interest paid: $319,425
• Loan term: 21 years (252 months)
• Savings: $172,155 + 9 years

How it works:

• Month 1: Extra $500 goes entirely to principal
• Remaining principal: $599,403 - $500 = $598,903
• Month 2: Interest calculated on lower balance
• Interest: $2,995 (not $3,000)
• Snowball effect: Each extra payment saves even more interest

Example: Lump Sum Principal Reduction

Scenario:

• Current loan: $550,000 remaining
• Receive bonus: $20,000
• Put entire bonus toward principal

Before bonus:

• Principal: $550,000
• Interest rate: 6.0% p.a.
• Monthly repayment: $3,297
• Years remaining: 23

After $20,000 principal reduction:

• Principal: $530,000
• Interest rate: 6.0% p.a.
• Monthly repayment: $3,297 (same)
• Years remaining: 21.5
• Savings: $28,400 interest + 1.5 years

Principal and LVR (Loan-to-Value Ratio)

How Principal Affects LVR

LVR = Principal ÷ Property Value × 100

Example 1: Purchase

• Property value: $750,000
• Principal: $675,000
• LVR: 90% (requires LMI)

Example 2: After 5 Years

• Property value: $900,000 (20% growth)
• Principal paid down: $50,000
• Remaining principal: $625,000
• LVR: 69% (substantial equity)

Refinancing Based on Lower Principal

Scenario:

• Original purchase: $700,000 property, $630,000 principal (90% LVR)
• 7 years later: Property worth $950,000, principal $550,000
• Current LVR: 58%

Refinancing options:

• Access equity: Borrow up to 80% LVR = $760,000
• Available equity: $760,000 - $550,000 = $210,000
• Use for: Investment property deposit, renovations, debt consolidation

Example use:

• Keep $550,000 for current home
• Borrow extra $150,000 for investment property deposit
• New principal: $700,000 across both properties
• New LVR on original home: 74%

Principal Reduction Strategies

Strategy 1: Increase Repayment Frequency

Monthly vs Fortnightly:

Monthly repayments:

• $600,000 loan at 6.0% p.a.
• Repayment: $3,597/month
• Total interest: $491,580
• Term: 30 years

Fortnightly repayments:

• Same loan
• Repayment: $1,799 fortnightly (26 payments/year)
• Effective yearly: $46,774 (vs $43,164 monthly)
• Extra principal: $3,610/year
• Total interest: $455,280
• Term: 27.5 years
• Savings: $36,300 + 2.5 years

Strategy 2: Round Up Repayments

Example:

• Required repayment: $3,597/month
• Round up to: $4,000/month
• Extra principal: $403/month

Result:

• Total interest: $359,200 (vs $491,580)
• Term: 22 years (vs 30 years)
• Savings: $132,380 + 8 years

Strategy 3: Use Offset Account

How it reduces principal (effectively):

Example:

• Principal: $600,000
• Offset balance: $50,000
• Interest charged on: $550,000 (not $600,000)

Monthly savings:

• Without offset: $3,000 interest
• With offset: $2,750 interest
• Extra $250 goes to principal automatically

Over 30 years:

• Total interest: $420,150 (vs $491,580)
• Term: 26.5 years (vs 30 years)
• Savings: $71,430 + 3.5 years

Principal in Interest-Only Loans

How Interest-Only Affects Principal

Standard principal-and-interest loan:

• Every repayment reduces principal
• Build equity over time

Interest-only loan:

• Repayments cover interest only
• Principal never reduces during interest-only period
• Lower repayments, but no equity building

Example: $700,000 investment property

Principal-and-interest:

• Repayment: $4,196/month at 6.0% p.a.
• Principal portion: $696/month (initially)
• After 5 years: Principal $668,000 (paid $32,000)

Interest-only (5 years):

• Repayment: $3,500/month
• Principal portion: $0
• After 5 years: Principal still $700,000

After interest-only period ends:

• Switch to principal-and-interest
• Repayments jump: $3,500 → $4,460/month
• Must pay off $700,000 in 25 years (not 30)
• Higher repayments than if you'd started with P&I

When Interest-Only Makes Sense

Investment properties:

• Tax-deductible interest
• Maximize cash flow for other investments
• Plan to sell before interest-only period ends

Example:

• Buy $650,000 investment property
• Interest-only: 5 years at 6.2% p.a.
• Repayment: $3,358/month
• After 5 years: Sell for $850,000
• Profit: $850,000 - $650,000 - costs = $180,000 (less CGT)
• Principal never mattered (you sold before P&I kicked in)

Principal and Refinancing

Lower Principal = Better Rates

Lenders reward lower LVR:

Example: $800,000 property

Borrower A (90% LVR):

• Principal: $720,000
• Rate: 6.4% p.a. (higher risk)
• LMI: $28,000
• Monthly repayment: $4,543

Borrower B (70% LVR):

• Principal: $560,000
• Rate: 5.8% p.a. (lower risk)
• LMI: $0
• Monthly repayment: $3,285

Difference:

• $160,000 less principal
• 0.6% p.a. better rate
• $1,258/month lower repayment
• Massive advantage for Borrower B

Refinancing to Reduce Principal Repayments

Scenario:

• Original loan: $650,000 at 6.5% p.a. (old rate)
• Paid down to: $580,000 after 5 years
• Property value: $850,000
• LVR: 68%

Refinance options:

• New rate: 5.9% p.a. (current market)
• Keep principal: $580,000
• Old repayment: $4,107/month
• New repayment: $3,438/month
• Savings: $669/month (lower rate + lower principal)

Tax Implications of Principal

Principal is NOT Tax-Deductible

Only interest is deductible (for investment loans).

Example: Investment property

• Principal: $500,000
• Monthly repayment: $2,997 at 6.0% p.a.
• Interest portion: $2,500 (tax-deductible)
• Principal portion: $497 (not tax-deductible)

Tax benefit:

• Deductible interest: $2,500/month = $30,000/year
• Tax bracket: 37% (plus Medicare levy 2%)
• Tax saving: $11,700/year (only on interest, not principal)

Debt Recycling to Deduct Principal Repayments

Strategy:

• Use equity from investment property to invest
• Investment loan interest becomes deductible

Example:

• Investment property principal paid down from $500K to $450K
• Access $50K equity via redraw
• Invest $50K in shares/managed funds
• Interest on $50K becomes tax-deductible (used for income-producing investment)

Common Mistakes with Principal

Mistake 1: Not Reducing Principal Fast Enough

Scenario:

• Borrow $700,000 at 6.0% p.a.
• Make minimum repayments only
• After 10 years: Principal $625,000 (only $75K paid off)
• You've paid $218,000 in interest, but only $75,000 in principal

Solution:

• Extra $300/month reduces principal by additional $90,000 over 10 years
• Interest saved: $54,000

Mistake 2: Increasing Principal When Refinancing

Scenario:

• Current principal: $550,000
• Property value: $850,000
• Refinance and withdraw $100,000 equity for renovations
• New principal: $650,000

Result:

• You've undone years of principal repayments
• Interest starts compounding on higher balance
• $100,000 extra principal = $180,000 extra interest (over 30 years at 6%)

Better approach:

• Only access equity if investment generates returns > interest cost
• Example: Renovations add $200K to property value = good use

Mistake 3: Confusing Principal with Repayment Amount

Common confusion:

• "I'm paying $4,000/month, so I'm reducing principal by $4,000/month"

Reality:

• $4,000 repayment includes principal AND interest
• Early in loan: Maybe $3,200 interest, $800 principal
• You're only reducing principal by $800/month, not $4,000

How NIK Finance Helps You Manage Principal

1. Compare Loans by Principal Reduction Speed

NIK Finance shows:

• Total interest paid over life of loan
• Principal balance after 5, 10, 15 years
• Effective cost per $100K borrowed

Example comparison:

• Lender A: 6.1% p.a., high fees → Principal $585K after 5 years
• Lender B: 5.9% p.a., low fees → Principal $568K after 5 years
• Lender B saves $17,000 in principal (faster payoff)

2. Calculate Impact of Extra Repayments

NIK Finance's calculator:

• Current principal: $600,000
• Extra repayment: $500/month
• Shows: $172,000 interest saved, 9 years off loan term

3. Offset vs Redraw for Principal Reduction

NIK Finance recommends:

• Offset: Keep savings separate, reduce interest on principal
• Redraw: Pay extra into loan, then withdraw if needed

Example:

• $50,000 in offset = same interest savings as $50,000 principal reduction
• But offset funds remain accessible (better for emergencies)

Final Thoughts

Principal is the foundation of every loan:

• Lower principal = less interest (every dollar of principal costs $2-3 in interest over 30 years)
• Reduce principal faster (extra repayments, fortnightly frequency, offset accounts)
• Monitor your principal (check loan statements to see how much you've paid off)
• Use equity wisely (don't increase principal unless investment returns exceed interest cost)

Typical $600,000 principal over 30 years:

• Minimum repayments: Pay $1,091,580 total (principal + interest)
• Extra $500/month: Pay $919,425 total
• Difference: $172,155 saved by reducing principal faster

Get a loan with features that help reduce principal:

• Compare 100+ lenders via NIK Finance
• Look for: Offset accounts, unlimited extra repayments, no early exit fees
• Start reducing your principal from day one

The earlier you reduce principal, the more you save:

• Extra $10,000 in year 1 saves ~$30,000 in interest over 30 years
• Extra $10,000 in year 20 saves ~$8,000 in interest over remaining term
• Front-load your principal reductions for maximum impact