Author: chandru

Lease quotes in the US show interest as a money factor, a small decimal like 0.0025, instead of an APR. It is easy to convert, and knowing how helps you spot a bad deal. Check any quote with the lease calculator.

Money factor to APR

APR ≈ money factor × 2,400. To go the other way, divide the APR by 2,400.

Money factor	Equivalent APR
0.0010	2.4%
0.0015	3.6%
0.0020	4.8%
0.0025	6.0%
0.0030	7.2%
0.0035	8.4%

How the money factor is used

The monthly finance (rent) charge = (net price + residual value) × money factor. On a car with a $31,000 net price and a $20,300 residual, a 0.0025 money factor adds $128.25 a month. A 0.0030 factor would add $153.90, about $925 more over 36 months.

Spotting a marked-up money factor

• Ask the dealer for the money factor and convert it to APR.
• Compare it with the lender’s published base rate for your credit tier, often shared on owners’ forums for each brand.
• Dealers are often allowed to add a markup; you can negotiate it down just like the price.

Frequently asked questions

Why use a money factor instead of APR?

It is a convention in lease maths: multiplying by the sum of net price and residual gives the average monthly finance charge directly.

Is a lower money factor always better?

Yes for the finance charge, but also check the negotiated price and residual value, which affect the payment more.

Related: Lease vs buy calculator · PCP explained (UK)

Cost per mile is the easiest way to compare petrol, diesel and electric cars. Enter your own fuel price and economy in the fuel cost calculator.

How to calculate cost per mile

• UK petrol or diesel: price per litre × 4.546 ÷ mpg (UK gallons are 4.546 litres).
• US gas: price per gallon ÷ mpg.
• Electric: price per kWh ÷ miles per kWh.

UK examples

Car	Assumption	Cost per mile
Petrol	45 mpg, £1.40 a litre	14.1p
Diesel	55 mpg, £1.45 a litre	12.0p
EV, home charging	3.5 miles/kWh, 25p/kWh	7.1p
EV, public rapid charging	3.5 miles/kWh, 70p/kWh	20.0p

US examples

Car	Assumption	Cost per mile
Gas	30 mpg, $3.50 a gallon	11.7¢
EV, home charging	3.5 miles/kWh, 16¢/kWh	4.6¢
EV, public fast charging	3.5 miles/kWh, 45¢/kWh	12.9¢

An EV charged at home costs roughly half as much per mile as petrol. Relying on public rapid chargers can make it cost as much as, or more than, petrol.

Frequently asked questions

How much does 10,000 miles cost?

Multiply the cost per mile by 10,000: at 14.1p a mile, about £1,410 a year in petrol; at 7.1p, about £710 for an EV charged at home.

Does cost per mile include servicing?

These figures are fuel only. For everything, use the total cost of ownership calculator or the EV vs gas calculator.

Example prices only; fuel and electricity prices change often.

The car payment is only part of what a car costs. Fuel, insurance, servicing and the value the car loses every month often add up to more. Add up your own costs with the total cost of ownership calculator.

Example: a $30,000 car

Cost	Per month	Assumption
Loan payment	$489	$5,000 down, 6.5% over 5 years
Fuel	$117	1,000 miles at 30 mpg, $3.50 a gallon
Insurance	$150	Example; varies a lot by driver and area
Servicing and tyres	$80	Spread over the year
Registration and fees	$20	Spread over the year
Total	$856

So the real cost here is about 75% more than the payment alone. These are example figures; your insurance and fuel costs may be very different.

The hidden cost: depreciation

Even after the loan is paid off, the car keeps losing value. If a $30,000 car is worth $15,000 after five years, it has cost you $250 a month in lost value. Check yours with the depreciation calculator.

Frequently asked questions

What share of my income should a car take?

A common guide is keeping all car costs under 15–20% of take-home pay. See how much car you can afford.

Is a used car cheaper per month?

Usually: a smaller loan and slower depreciation, though repairs may cost more. Compare both in the calculator above.

Related: Fuel cost calculator · Car loan calculator

Electric cars cost more to buy in India but much less to run, especially if you charge at home. Enter your own fuel price, mileage and electricity tariff in the calculator to see your numbers.

Cost per km (example prices)

Car	Assumption	Cost per km	Cost for 1,000 km a month
Petrol	15 km/l at ₹100/l	₹6.67	₹6,667
EV, home charging	7 km/kWh at ₹8/kWh	₹1.14	₹1,143
EV, public fast charging	7 km/kWh at ₹20/kWh	₹2.86	₹2,857

Charging mostly at home saves about ₹5,500 a month, or about ₹66,000 a year, at 1,000 km a month. If an EV costs ₹3 lakh more than a similar petrol car, that difference is recovered in about four and a half years from fuel savings alone.

What changes the answer

• How far you drive: the more km, the faster an EV pays back.
• Where you charge: regular fast charging narrows the gap.
• Your electricity tariff: check your state’s slab rates; some offer EV tariffs.

Frequently asked questions

How much does it cost to charge an EV fully at home?

A 40 kWh battery charged from 20% to 100% takes about 32 kWh plus charging losses, roughly ₹280–300 at ₹8 per unit. Try the EV charging cost calculator.

What about servicing costs?

EVs have fewer moving parts and usually cost less to service, but tyres and insurance can cost more. Include everything with the total cost of ownership calculator.

Example prices only; fuel prices and tariffs vary by city and state.

House rent allowance (HRA) can be partly or fully tax-free if you live in rented housing and choose the old tax regime. The tax-free amount is the lowest of three limits. Here is how it works in practice.

The three limits

1. HRA actually received.
2. Rent paid minus 10% of basic + DA.
3. 50% of basic + DA in Delhi, Mumbai, Kolkata, Chennai, Bengaluru, Hyderabad, Pune or Ahmedabad; 40% elsewhere.

Three worked examples (yearly)

Monthly basic / HRA / rent	City	Limit 1	Limit 2	Limit 3	Tax-free HRA
₹30,000 / ₹10,000 / ₹20,000	Bengaluru	₹1,20,000	₹2,04,000	₹1,80,000	₹1,20,000 (all of it)
₹50,000 / ₹20,000 / ₹18,000	Chennai	₹2,40,000	₹1,56,000	₹3,00,000	₹1,56,000
₹40,000 / ₹20,000 / ₹25,000	Coimbatore	₹2,40,000	₹2,52,000	₹1,92,000	₹1,92,000

In the second example, ₹84,000 of HRA stays taxable because rent is low compared with salary. Paying more rent does not always help: the exemption can never exceed the HRA you receive.

Documents and rules

• Keep rent receipts or a rent agreement; your employer will ask for proof.
• If rent is more than ₹1 lakh a year, you need your landlord’s PAN.
• You can pay rent to your parents if they own the home, but they must show it as income in their tax return.
• HRA exemption is not available under the new tax regime.

Frequently asked questions

What changed in FY 2026-27?

Under the Income-tax Rules 2026, Bengaluru, Hyderabad, Pune and Ahmedabad joined Delhi, Mumbai, Kolkata and Chennai in the 50% group.

Can I claim HRA and a home loan together?

Yes, if you live in a rented home, for example because your own home is in another city. See the home loan tax benefit calculator.

An estimate; confirm with your employer or a tax professional. Related: Old vs new tax regime

Gratuity is a lump sum paid by your employer when you leave, retire or are laid off after years of service. The formula is simple once you know which salary counts and how years are rounded.

The formula

Gratuity = last drawn wages × 15 ÷ 26 × years of service. “Wages” mainly means basic pay + DA. Under the Labour Codes, if allowances excluded from wages are more than 50% of your pay, the excess is added back. A part-year of more than six months counts as a full year.

Examples

Monthly wages	Service	Years counted	Gratuity
₹30,000	10 years	10	₹1,73,077
₹50,000	5 years 7 months	6	₹1,73,077
₹1,00,000	20 years	20	₹11,53,846
₹40,000	1 year (fixed-term)	1	₹23,077

Who is eligible?

• Permanent employees: usually 5 years of continuous service.
• Fixed-term employees: 1 year, under the Labour Codes in force from 21 November 2025.
• Death or disablement: no minimum service.

Frequently asked questions

How is gratuity taxed?

For private-sector employees, up to ₹20 lakh is tax-free in a lifetime; anything above is taxed at your slab rate. Government employees’ gratuity is fully exempt.

What if my employer is not covered by the gratuity law?

The formula for tax purposes uses half a month’s average salary (of the last 10 months) for each completed year. The calculator has an option for this.

Related: Gratuity calculator · EPF calculator

Should you invest all at once (lumpsum) or a fixed amount every month (SIP)? The answer depends on whether you already have the money and how you handle market ups and downs. Try both with the calculators below.

Same ₹12 lakh, two ways, at 12% a year

	Lumpsum: ₹12 lakh today	SIP: ₹10,000 a month for 10 years
Total invested	₹12 lakh	₹12 lakh
Value after 10 years	₹37.27 lakh	₹23.23 lakh

The lump sum ends far higher because all of it is invested for the full 10 years, while most SIP instalments are invested for much less time. This comparison only makes sense if you already have the ₹12 lakh.

When a SIP is the better choice

• You invest from salary. Most people do not have a large sum, so a SIP is the natural way to invest.
• You worry about timing. Investing a lump sum just before a fall hurts; a SIP spreads purchases across good and bad months.
• You want discipline. An automatic SIP keeps you investing without decisions.

A middle path for a large sum: put it in a low-risk fund and move it into equity monthly over 6–12 months (an STP).

Frequently asked questions

Do SIPs give better returns?

Not automatically. In a rising market a lump sum usually wins; in a falling or choppy market a SIP can buy more units cheaply. Over long periods, time in the market matters most.

How do I calculate SIP returns?

Use the SIP calculator. Returns are not guaranteed; the figures assume a steady average.

Related: Step-up SIP · CAGR calculator

A step-up (top-up) SIP raises your monthly investment every year, usually in line with your salary increase. Small yearly increases make a very large difference over time. Use the step-up option in the SIP calculator to try it.

₹10,000 a month for 20 years at 12%

	Flat SIP	Step-up SIP (+10% a year)
Monthly SIP in year 20	₹10,000	about ₹61,200
Total invested	₹24 lakh	₹68.7 lakh
Value after 20 years	₹99.9 lakh	₹1.99 crore

Raising the SIP by 10% each year roughly doubles the final amount. You invest more, but the extra feels manageable because it grows with your income.

How to set one up

• Most fund houses and apps offer a “top-up” option when you start a SIP: choose a fixed amount or a percentage each year.
• Match the step-up to your expected salary increase, for example 5–10%.
• If you cannot automate it, raise the SIP yourself each year after your appraisal.

Frequently asked questions

Is a step-up SIP better than a bigger flat SIP?

If you can afford a bigger SIP now, starting higher is even better because earlier money compounds longer. A step-up suits most people because income rises over time.

Are 12% returns guaranteed?

No. Equity fund returns vary from year to year; 12% is used here only to show the effect.

Related: SIP vs lumpsum · Retirement calculator

If you have several debts, the order you pay them off matters. The avalanche method targets the highest interest rate first; the snowball method targets the smallest balance first. Plan each card with the calculator below.

Worked example: $500 a month towards three debts

Debt	Balance	Rate	Minimum
Card A	$3,000	24%	$90
Card B	$1,000	18%	$30
Loan C	$6,000	9%	$150

	Avalanche	Snowball
First debt cleared	Month 11 (Card A)	Month 4 (Card B)
Debt-free in	23 months	23 months
Total interest	$1,225	$1,277

The avalanche saves the most money. The snowball costs a little more here but clears a debt much sooner, which keeps many people motivated.

Which should you choose?

• Choose avalanche if your rates are very different and you can stick to a plan.
• Choose snowball if you have struggled to stay on track and quick wins would help.
• Either way, always pay at least the minimum on every debt and stop adding new debt.

Frequently asked questions

Does a balance transfer help?

A 0% balance transfer can cut interest a lot if you clear it before the offer ends and the fee is small.

Should I use savings to pay off debt?

Keep a small emergency fund, then using savings to clear high-interest card debt is usually worthwhile.

Related: 50/30/20 budget calculator · Flat vs reducing interest

The 50/30/20 rule splits your take-home pay three ways: 50% for needs, 30% for wants and 20% for savings and extra debt payments. It is one of the simplest ways to start budgeting. Enter your pay to see your own split.

Examples

Monthly take-home pay	Needs (50%)	Wants (30%)	Savings (20%)
$4,000	$2,000	$1,200	$800
£2,500	£1,250	£750	£500
₹75,000	₹37,500	₹22,500	₹15,000

Needs, wants and savings

• Needs: things you must pay to live and work: rent or EMI on your home, bills, groceries, transport, insurance and minimum loan payments.
• Wants: things you could cut: eating out, takeaways, shopping, subscriptions, trips and hobbies.
• Savings: emergency fund, investments such as SIPs, retirement, and paying off debt faster.

When 50/30/20 does not fit

In expensive cities, rent alone can take half your pay. Then try 60/20/20, or 70/20/10 on a tight budget. The order matters: cut wants first and keep saving something every month, even if it is less than 20%.

Frequently asked questions

Should I use gross or take-home pay?

Take-home pay, after tax and other deductions from your salary.

What should I do with the 20%?

Build an emergency fund of a few months’ expenses first, then pay off high-interest debt, then invest. See how savings grow with the investment calculator.

Related: 50/30/20 budget calculator · Savings goal calculator · Hourly to yearly salary