SIP vs lump sum in Nepali mutual funds: which actually builds more

A reader who sold a small plot in his village last year asked the question cleanly. He had Rs 12 lakh sitting in a savings account, he had decided on a mutual fund, and he wanted to know one thing: dump it all in on Monday, or feed it in over the next year? His brother said lump sum, a YouTube video said SIP, and the two pieces of advice could not both be right.

They can both be defensible, which is the honest and annoying answer. The choice between a one-time lump sum and a Systematic Investment Plan is not a matter of which is "better" in the abstract. It depends on what the market does next, which nobody knows, and on how you would behave if it fell 40% the week after you invested. This post lays out the global evidence, why NEPSE bends that evidence, and a worked rupee example so the trade-off is concrete. The mechanics of setting up either one, the demat, the auto-debit, the loads, live in how to start a SIP in a Nepali mutual fund; this is the decision that comes before the setup.

First, both routes need an open-end fund

One structural point decides where this question even applies. A SIP only works with open-end schemes, the funds you buy and redeem directly from the fund manager at the daily NAV, not the closed-end funds listed on NEPSE that trade at a market price (often 10–20% below NAV, sometimes 30% or more). A lump sum can technically go into either, but to compare like with like, both the SIP and the lump sum here go into the same open-end fund. The split between the two fund types, and why it matters, is covered in closed-end vs open-end mutual funds.

The entry minimums are effectively the same: most managers set the SIP floor at Rs 1,000 a month, and a one-time lump sum into the same fund starts at the minimum 100 units, roughly Rs 1,000 at the prevailing NAV. So the question is never about access. It is purely about timing: all at once, or spread out.

The global evidence: lump sum wins about two-thirds of the time

Start with what the data says, then adjust for Nepal.

The most-cited study is Vanguard's, and it is blunt: across long US and global histories, lump-sum investing beat dollar-cost-averaging about two-thirds of the time (around 67% for a 60/40 portfolio), outperforming by an average of about 2.3% over a 12-month deployment window. The logic is simple. A market spends more time rising than falling, so the sooner your money is in, the more of that rise it captures. A SIP, by design, holds part of your cash on the sidelines while it drips in, and that idle cash earns close to nothing. The drag is the cost of waiting.

This is genuinely global, US-anchored data, not a Nepali study, and no Nepal-specific comparison of the two strategies appears to exist. So it tells you the base rate, the way to bet if you had to bet blind, but it does not capture how a market like NEPSE actually behaves.

Why NEPSE complicates the textbook answer

The Vanguard finding assumes a market that wobbles but grinds upward. NEPSE grinds upward over decades (a 2019 study pegged its first-22-year price return at about 8.69% a year excluding dividends), but it does so through swings violent enough to change the calculation.

The index hit an all-time high of 3,198.60 on 18 August 2021 (ShareSansar), then fell to about 1,848 by late June 2022, shedding roughly 42% of its value (Investopaper). It closed 2022 near 2,029, 2023 near 2,069, 2024 near 2,577, and 2025 near 2,634, climbing back toward 2,714 by early 2026 (year-end closings on merolagani). The autumn-2025 correction shows up in every equity open-end fund's NAV: Shubha Laxmi Kosh, for instance, fell from about Rs 11.59 in mid-2025 to Rs 9.78 by Ashwin, recovering only to Rs 9.97 by Kartik, still below the Rs 10 par (ShareSansar).

A 42% drawdown is the difference that matters. In a market that can halve, the person who lump-summed at 3,198 in 2021 was down badly for two years, while a SIP through that period kept buying at 2,500, then 2,200, then 1,900, averaging the entry down. The textbook says lump sum wins on average. NEPSE says: yes, but the years it loses, it can lose hard, and whether you can sit through that without selling is a question only you can answer. Whether the index is cheap or dear right now is its own analysis, in is NEPSE expensive.

The math: same Rs 1.2 lakh, three different markets

Here is the trade-off in rupees. The numbers below are a calculation, not a sourced fact: assume Rs 1,20,000 to invest, a starting NAV of Rs 10, and a choice between buying it all today (lump sum) or Rs 10,000 of units a month for 12 months (SIP). Uninvested cash earns nothing, and loads and tax are set aside to isolate the timing effect. The only thing that changes across the three columns is the NAV path over the year.

Market over the year	Lump sum end value	SIP end value	Winner
Rising (NAV 10.00 → 11.00)	Rs 1,32,000	~Rs 1,25,700	Lump sum, by ~Rs 6,300
Falling (NAV 10.00 → 9.00)	Rs 1,08,000	~Rs 1,13,700	SIP, by ~Rs 5,700
Crash then recovery (10 → 8 → 10)	Rs 1,20,000	~Rs 1,32,800	SIP, by ~Rs 12,800

Read the three rows together. In a steadily rising year, the lump sum is in the market the whole time and pulls ahead. In a falling year, both lose money, but the SIP's later, cheaper purchases cushion the loss. The third row is the one Nepali investors should sit with: when the market crashes and recovers to where it started, the lump sum is flat, dead even, while the SIP gained about 10% purely by buying units at Rs 8 during the dip. That is rupee-cost-averaging doing exactly what it is supposed to.

The catch is that you do not get to pick the column in advance. NEPSE has produced all three patterns in the last five years. The lump sum is the bet that the market rises from here; the SIP is the bet that you cannot tell, so you would rather not have your whole entry hinge on one day's NAV.

Tax and loads: nearly identical, so it is not a tax decision

A clean point that removes one variable. The tax treatment is the same either way. Cash dividends from the fund face 5% final TDS for a natural person, and capital gains on redemption are 5% if held over 365 days and 7.5% if under (NIC Asia Capital). Whether you arrived at your units via a SIP or a lump sum changes nothing here.

The one real difference is the exit load, the redemption fee in the first year. SSIS charges 1.5% if you redeem within one year and nil after; NIBL Sahabhagita uses a tiered scale that reaches zero after two years. For a lump sum held for years this never bites. For a SIP, the most recent installments are always recent, so redeeming soon after your final installment can trigger the load on those last units. It is a minor cost, but it argues for the same thing both strategies need anyway: a multi-year holding period. The broader load and fee picture sits alongside the FD vs mutual fund vs CIT comparison.

The honest verdict for a Nepali saver

The decision splits cleanly by where the money comes from.

Money saved from salary is a SIP, full stop. You do not have a lump sum to deploy; you have Rs 5,000 or Rs 10,000 left over each month. Investing it as it arrives is not a strategy choice, it is the only option, and it happens to be the disciplined one. This is the case the start-a-SIP guide is built for, and the slow contributions-then-compounding curve it produces is the same one described in the first Rs 10 lakh.

A windfall is where the real question lives: a Dashain bonus, a gratuity payout, a matured FD, a plot sale, money sent home. Three honest readings:

• If the windfall is small relative to your total savings and your horizon is long, the global evidence says lump sum, and the expected cost of overthinking it is higher than the risk.
• If the windfall is large relative to your net worth, your whole gratuity, the plot money, phase it in over three to six monthly tranches. You give up a little expected return for a lot less regret if NEPSE picks that month to repeat 2021.
• Whatever you do, do not park it in a savings account "until the market dips." Sitting in cash waiting for a better entry is itself a timing bet, and it is the one that most reliably loses, because the dip you are waiting for often arrives only after a rise you missed.

What a SIP genuinely buys you in a market this volatile is not maximum return. It is the removal of the single worst outcome, putting your entire chunk in at the top, and the behavioural cover to keep investing when the headlines are ugly. For comparison against the other places that same money could go, the NEPSE vs SIP vs FD case study runs the numbers on a larger sum.

What you actually need to know

Three lines:

1. Lump sum wins more often, SIP hurts less when you are wrong. The global base rate favours lump sum by about two-thirds; NEPSE's habit of halving means the times it loses can be brutal.
2. The source of the money decides the strategy. Salary savings are a SIP by default. A windfall is the only place the choice is real, and there the safe answer for a large sum is to phase it over three to six months.
3. It is not a tax decision. Both routes carry the same 5% dividend and 5%/7.5% capital-gains treatment. The deciding factors are the market's path, which you cannot know, and your own stomach, which you can.

Sitting on a windfall and torn between dumping it in or dripping it? Email parjanya57@gmail.com and I will work through the trade-off with your actual numbers.

This post is part of the Nepal Money Basics guide — the investing section.