Advanced: Growth, Inflation, and Time Range

Once you have a working projection, the next step is making it realistic. A projection that freezes today's numbers for ten years isn't a forecast - it's a guess that's wrong by design. This tutorial covers the advanced controls that fix that: per-item growth and inflation rates, the projection time range, and the frequency and start/end dates that let you model raises, life changes, and one-off events.

Simple vs. advanced input

FinProjection has two input modes you can switch between anytime:

• Simple mode - name, amount, and a rate. Best for getting started and for items that just tick along unchanged.
• Advanced mode - adds frequency, start and end dates, and full per-item rate control. This is where everything below lives.

Growth: income and assets that rise

Income growth

Each income source has a growth rate- how much it rises per year from raises and promotions. A 2–4% annual rate is a reasonable default for salaries. Freeze income at today's figure and a ten-year projection will badly understate where you end up.

Asset growth

Each asset has its own growth rate too. A high-yield savings account might grow ~4%, a long-run stock portfolio ~6–7%, idle cash near 0%. Because growth compounds, small differences here swing your long-term net worth dramatically - so favor conservative, long-run averages over optimistic ones.

Inflation: expenses that creep up

Each expense has an inflation rate so a $1,500 grocery bill today is modeled as a larger number years out. Around 3% is a sensible default. Applying inflation keeps your future expenses honest - and it's the difference between a plan that looks comfortable and one that actually holds up.

Choosing your projection time range

The projection time range(in Settings) controls how many years the simulation runs. Pick it to match the question you're asking:

• A few years - to see a debt-free date or a near-term goal clearly, without distant noise.
• A decade or more - to watch compounding do its work and judge long-term net worth.

A longer range shows more of the cash flow table and stretches the chart's horizon. For a quick, temporary change to the horizon without touching your settings, the what-if sliders also include a projection-years control.

Frequency: monthly, annual, and one-time

In advanced mode, an income or expense can be:

• Monthly - the default, recurring every month.
• Annual - once a year in a month you choose (a bonus, an insurance premium, property tax).
• One-time- a single event on a specific date (a tax refund, a big purchase). These appear tagged in the cash flow breakdown so they're easy to spot.

Modeling these as true events - rather than averaging them across the year — is what makes your monthly cash flow realistic, especially in the months a large irregular amount lands.

Start and end dates: modeling life changes

The most powerful advanced feature: any income or expense can have a start date and an end date, so your projection follows real events.

1. 1

   A raise or a new job

   Add a higher income line with a future start date (or end the current one and start a new one). Your cash flow steps up on exactly the month it happens.

2. 2

   A cost that ends

   Childcare for ages 0–5, a lease, a subscription: set an end date and the expense drops out after it, freeing up cash flow for saving.

3. 3

   A planned break

   End an income the month it pauses and restart it later. The projection shows the dip - and whether your savings absorb it without a shortfall.

Put it into practice

With realistic assumptions in place, open your plan and watch how a single rate change ripples through the net worth chart and cash flow table. If you want the reasoning behind the numbers, our financial planning guides go deeper on long-term projection and debt payoff strategy.