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Calcimator

Annual Budget Review Calculator

YoY category trend index.

About this calculator

This calculator compares this year's income, spending, and savings to last year's to surface whether your financial trajectory is actually improving. Trend Index is the headline figure: it adds the change in your Savings Rate (this year's saved-as-a-percentage-of-income minus last year's) to the change in your Spending-to-Income Ratio (last year's minus this year's, so a SHRINKING ratio counts as positive). A positive Trend Index means you're saving a larger share of income and/or spending a smaller share than a year ago; a negative one means the opposite, even if both your income and your nominal spending both went up.

Real Spending Change adjusts nominal Spending Change for the Inflation Rate you enter, and Lifestyle Inflation is whatever's left over after subtracting inflation — spending growth beyond what rising prices alone would explain, floored at zero so a real spending DECREASE never shows as negative lifestyle inflation. Inflation Rate only feeds Real Spending Change and Lifestyle Inflation; it has no path into Trend Index, Income Change, Savings Rate, or Spending-to-Income Ratio, all of which compare nominal dollar figures between the two years directly. This is a comparison tool, not a forecast — it tells you what already happened between two specific years, using whatever income, spending, and savings figures you enter for each.

Inputs

%

Results

Trend index

1.54

Income change (%)7.69%
Spending change (%)8%
Real spending change (%)5%
Lifestyle inflation (%)5%
This year savings rate (%)17.14%
Last year savings rate (%)15.38%
Savings rate change (pp)1.76
Spending-to-income ratio (%)77.14%
How to Use This Calculator
  1. Enter Last year's income ($) and This year's income ($).
  2. Enter Last year's spending ($) and This year's spending ($), then Last year saved ($) and This year saved ($).
  3. Set Inflation rate (%) to compute real (inflation-adjusted) spending change.
  4. Review the Trend index — positive means an improving savings/spending trajectory relative to income.
  5. Use Income change (%) and Spending change (%) alongside Lifestyle inflation (%) to see where the trend is coming from.

How the result changes with This year's spending ($)

This year's spending ($)Trend index
27,00040.11
40,50020.82
81,000-37.03
135,000-114.18

What each input means

Last year's income ($)
Total gross income earned last year.
This year's income ($)
Total gross income earned this year.
Last year's spending ($)
Total spending last year across all categories.
This year's spending ($)
Total spending this year across all categories.
Last year saved ($)
Total amount saved or invested last year.
This year saved ($)
Total amount saved or invested this year.
Inflation rate (%)
Annual inflation rate to calculate real spending changes.

What each result means

Trend index
Positive = improving financial trajectory. Combines savings rate gain and spending ratio reduction.
Income change (%)
Year-over-year income growth or decline.
Spending change (%)
Year-over-year nominal spending increase or decrease.
Real spending change (%)
Spending change adjusted for inflation. Positive = spending grew faster than prices.
Lifestyle inflation (%)
How much spending grew beyond inflation — pure lifestyle creep.
This year savings rate (%)
Savings as a percentage of income this year.
Last year savings rate (%)
Savings as a percentage of income last year.
Savings rate change (pp)
Percentage-point improvement in savings rate year over year.
Spending-to-income ratio (%)
This year's spending as a percentage of income. Lower is better.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    7 parameters
    Last year's income ($) = 65000, This year's income ($) = 70000, Last year's spending ($) = 50000, This year's spending ($) = 54000, Last year saved ($) = 10000, This year saved ($) = 12000, Inflation rate (%) = 3 = 7 input(s) provided
  2. Calculate Trend index
    Trend index = savingsRateChange + (lastSpendRatio - thisSpendRatio)
    1.54 = 1.54
  3. Calculate Income change
    Income change = lastYearIncome > 0
    7.69 = 7.69%
  4. Calculate Spending change
    Spending change = lastYearSpending > 0
    8 = 8%

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Why doesn't Inflation Rate affect the Trend Index?

Trend Index is built entirely from nominal (not inflation-adjusted) figures — the change in your savings rate and the change in your spending-to-income ratio, both computed directly from the dollar amounts you enter for each year. Inflation Rate only enters Real Spending Change and Lifestyle Inflation, a separate pair of outputs that specifically isolate how much of your nominal spending growth outpaced rising prices.

What's the difference between Spending Change (%) and Lifestyle Inflation (%)?

Spending Change (%) is the raw, nominal year-over-year change in your total spending, with no adjustment for prices. Lifestyle Inflation (%) subtracts the Inflation Rate you entered from that figure and floors the result at zero, isolating spending growth that outpaced inflation — genuine lifestyle creep — from spending growth that was actually just prices rising while your real consumption stayed flat.

Can Trend Index be positive even if my nominal spending went up?

Yes — Trend Index depends on your spending and savings relative to your INCOME, not on spending in isolation. If your income grew faster than your spending, your Spending-to-Income Ratio shrinks even with higher nominal spending, and if your Savings Rate also improved, Trend Index can be comfortably positive despite spending more dollars than last year.

Why is Lifestyle Inflation never negative, even in a year I cut spending?

Lifestyle Inflation is floored at zero by design — it only measures spending growth that exceeds inflation, not spending that falls behind it. A year where your real (inflation-adjusted) spending actually dropped shows as 0% Lifestyle Inflation rather than a negative number; that improvement instead shows up as a negative Real Spending Change (%), which is not floored.

How is Savings Rate Change different from Trend Index?

Savings Rate Change (pp) is only one of Trend Index's two components — it is this year's savings rate minus last year's, in percentage points. Trend Index adds the change in your Spending-to-Income Ratio on top of that, so a year with an unchanged savings rate can still show a positive Trend Index if spending fell as a share of income, or a negative one if it rose.

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