There's a window every year where saving more is genuinely painless, and almost nobody uses it. It opens when your increment is announced and closes about three weeks after the first higher salary lands. After that the money has found somewhere to go, and getting it back feels like a cut.
I've watched this for twelve years and it's the most reliable pattern I know. Not a clever one. Just a window.
Why the timing works
Money you have never received is easy to commit. Money you have received for two months is already part of your life.
Somebody whose salary rises and who raises the instalment in the same week feels nothing at all, because their spending never adjusted upward. Somebody who waits until the third month has already absorbed it, and now raising the instalment means spending less than they did last month. Those two situations are arithmetically identical and psychologically nothing alike.
That's the whole idea. It isn't about willpower, it's about sequence.
What usually happens instead
The increment arrives, there's a good feeling about it, and a plan forms to sort out the investing side once things settle.
Then the higher salary starts arriving. A slightly better phone. Eating out a bit more often. A subscription. None of it is extravagant and none of it is a decision anybody remembers making. By month three the extra is gone into a slightly better standard of living, which is a perfectly reasonable thing to buy, except that nobody chose to spend the whole of it that way.
Then next year the same thing happens. I've seen people whose income tripled over a decade and whose monthly instalment never moved, which our post on the regrets clients actually have lists as the third most common regret I hear.
The split I'd suggest
I'm not going to tell anybody to invest the entire increase. That's advice nobody follows, and an increment you get no benefit from is a poor incentive to work.
What works in practice is dividing it before it arrives. Some share to the instalment, some share to spending, decided in advance and written down. Half and half is a reasonable starting point and there's nothing magical about it.
The important part is that the spending share is deliberate too. A household that names it spends less than one that doesn't, because the unnamed version has no limit on it.
Make it automatic and stop deciding
The better version of all this is to remove the annual decision entirely.
A step-up instruction raises the instalment by an amount or percentage you choose, on a schedule, without anybody doing anything. Set it once when the SIP starts and the window never has to be caught again, which our page on the step-up SIP covers.
Most providers offer it and most people don't switch it on, because at the point of filling the form it doesn't feel urgent. Our page on types of SIP goes through the other boxes on that form worth thinking about.
If yours is already running without it, adding it is a small instruction rather than a new SIP.
Three other things the same week is good for
Since you're looking at the money anyway.
Check the mandate limit. If your bank mandate authorises a maximum that your new instalment would exceed, the increase will simply fail. This catches people every year and it's fixable in advance.
Top up the buffer. Household costs rise along with income, so a buffer sized three years ago is covering fewer months than it was. Our page on building an emergency fund covers the sizing.
Look at what the increment does to your tax position. Not something I can advise on, and worth a conversation with whoever does your return before the year gets away from you.
The version for people without an increment
Plenty of households do not get an annual letter, and the same principle still applies, just with a different trigger.
For a business owner or a freelancer, the equivalent moment is a good quarter rather than a date. The window works the same way: a share of unusually good income committed immediately is painless, and the same money two months later has been absorbed. Our page on investing as a freelancer covers the percentage approach that makes this workable.
There is also a moment nobody thinks of as an increment at all. A loan finishing. The household has already lived without that money for years, so redirecting the instalment amount to investing changes nothing about daily life and adds a substantial sum to what is being saved.
That last one is the most painless of all, and it is the one people most often let slip into general spending.
When an increment should not go to investing
Two situations, and both come first.
If there's a credit card balance rolling over or a personal loan at a steep rate, the increase goes there. Clearing it has a certain outcome, which nothing you invest in does.
And if the household has no buffer at all, that gets built before the instalment rises. Our post on the times I tell somebody to stop covers the same ordering in the opposite direction.
Neither of those is a reason to skip the window. It's the same window, just used for something with a better return than any scheme can offer.
What about a promotion with a job change
Slightly different, and worth separating, because more breaks than the amount.
A new employer usually means a new salary account, and an instalment attached to the old one will quietly fail. Our post on what a job change does to your SIP lists what to update.
So in that case the sequence is: get the instalment running from the new account first, confirm one debit has actually gone through, and only then raise the amount. Raising an instalment that isn't running is a common and slightly comic way to save nothing at all.
What to do with the part you keep
Since I am arguing for splitting the increase rather than investing all of it, the spending half deserves a sentence.
The version that works is deciding what it is for. A specific thing, named. The version that does not work is leaving it unallocated, because unallocated money does not stay unspent, it just gets spent without anybody choosing.
Households that name the figure spend less of it than households that do not, which sounds backwards and is consistent enough that I now say it in every meeting.
And if part of the increase is meant for something with a date, such as a purchase in two years, that is not investing money at all and should go somewhere stable, which our page on asset allocation sets out.
The size of this over a career
I'm not going to publish a figure, because any number I gave you would rest on an assumed rate that nobody knows, and we don't do that on this site.
What I'll say qualitatively is that of everything within your control, this is the one with the largest effect. Not the scheme. Not the timing of your entry. Whether the amount grew with your income over twenty years, or stayed where a twenty-six-year-old set it.
The window is open for about three weeks a year. It costs nothing to use and there's no way to make up for a decade of missing it. Myfolios is an AMFI-registered mutual fund distributor (ARN-145870) working from Indore since 2014, and raising an instalment takes about five minutes if you'd like help with it.
