Side-hustlers face a different version of the investing-app question than W-2 employees. Income varies. Subscriptions don't pause in zero-income months. And the SEP IRA — which is by far the highest-leverage retirement account for self-employment income — sits outside the consumer-app ecosystem entirely.
How we ranked these
Slyce is on this list because the no-subscription / per-purchase mechanic fits irregular income cleanly. We're honest about where it doesn't fit (Slyce has no IRA at launch, so the SEP IRA layer requires a separate brokerage).
Criteria, in order:
- Cost structure for irregular income. Subscription drag in zero-income months matters.
- Account-type support relevant to 1099 earners. SEP IRA, Solo 401(k), and Roth IRA matter more than they do for W-2 earners.
- Match to the side-hustle pattern. Spend-to-own captures pass-through spending; round-ups capture aggregated transactions; robo-advised captures lump-sum deposits.
- Honest tradeoffs.
1. Slyce — spend-to-own, no subscription
What it automates: linked-card purchases trigger fractional-share buys. Zero monthly fee, so zero-income months don't cost anything[1].
Pricing: $0 per month.
Accounts: individual taxable. No IRA at launch.
Where Slyce wins for side-hustlers: the no-subscription math, and the per-purchase mechanic that scales with actual spending. The spend-to-own guide walks the long-term arithmetic. For side-hustlers whose business spending flows through a linked card, every business purchase becomes a fractional-share buy.
Where Slyce doesn't win: no SEP IRA, no Solo 401(k), no Roth IRA at launch. Side-hustlers building retirement savings need a separate brokerage account for those layers.
2. Fidelity (or Schwab / Vanguard) — for the SEP IRA specifically
What it offers: SEP IRA, Solo 401(k), Roth IRA, and individual brokerage accounts. $0 monthly fee. Full self-employment retirement-account support[2].
Pricing: $0 per month for self-directed accounts.
Where Fidelity wins for side-hustlers: the SEP IRA is genuinely the highest-leverage tax-advantaged account for self-employment income. Fidelity's SEP IRA opens in minutes, has no setup fee, and the contribution math is straightforward. Solo 401(k) is similar. For W-2 plus 1099 hybrid earners, layering the SEP IRA on top of an employer 401(k) is doable.
Where Fidelity doesn't win: no spend-triggered automation. The app is feature-dense. Side-hustlers who want investing to happen in the background should use Fidelity for the IRA layer specifically and a different app for the rest.
3. Robinhood — for the self-directed slice
What it automates: nothing. Robinhood is a self-directed brokerage[3].
Pricing: $0 per month base.
Accounts: individual taxable, Robinhood Retirement (Traditional and Roth IRA with a contribution match).
Where Robinhood wins for side-hustlers: $0 monthly fee, and the IRA contribution match is real. For active traders who happen to have side-hustle income, Robinhood is a reasonable home.
Where Robinhood doesn't win for side-hustlers: no SEP IRA. No Solo 401(k). No spend-to-own. The IRA match applies to standard Roth/Traditional contributions only. Slyce vs Robinhood walks the broader head-to-head.
4. Acorns — round-ups, but watch the subscription
What it automates: round-ups on linked-card purchases. Acorns Later supports IRA[4].
Pricing: monthly subscription with tiers.
Where Acorns wins for side-hustlers: if your side-hustle income is steady enough to absorb the subscription, Acorns's diversified-ETF approach is a fine default. The IRA option (Acorns Later) supports Traditional, Roth, and SEP — though the SEP at a full-service brokerage is usually the better fit.
Where Acorns doesn't win for side-hustlers: subscription drag in zero-income months. The round-up mechanic ties to consumer spending more cleanly than to side-hustle business spending.
5. Betterment — for goal-based planning across multiple goals
What it automates: robo-advisor with multi-goal portfolios — retirement, business reserve, house, emergency fund[5].
Pricing: percentage-of-assets fee.
Where Betterment wins for side-hustlers: if you have multiple goals (retirement + business reserve + house + emergency fund) and want a robo-advisor managing them separately with goal-specific risk profiles, Betterment is the category standard.
Where Betterment doesn't win for side-hustlers: no SEP IRA support specifically optimized for self-employment income. The standard Betterment Roth and Traditional IRA accounts work, but the SEP path is cleaner at Fidelity / Schwab / Vanguard.
On the SEP IRA layer
For any side-hustler with self-employment income, a SEP IRA is the most under-discussed high-leverage account. The contribution limit scales with self-employment income — up to roughly 25% of net self-employment earnings, capped at the annual statutory limit[2].
The math: a side-hustler with $40,000 of net self-employment income can contribute roughly $10,000 to a SEP IRA, fully tax-deductible against the income. At a 22% federal marginal rate plus the 15.3% self-employment tax (the deductible portion of which has its own treatment), the deduction is genuinely material.
Open the SEP at Fidelity, Schwab, or Vanguard. Contribution rules and timing are documented in IRS Publication 590-A. Most consumer apps don't support SEP IRAs cleanly — for the SEP layer, the major brokerages are the right tool.
Verdict for side-hustlers
- Want spend-to-own with no subscription: Slyce.
- Want a SEP IRA or Solo 401(k): Fidelity, Schwab, or Vanguard.
- Want self-directed trading plus an IRA with a match: Robinhood.
- Want round-ups if your income absorbs the subscription: Acorns.
- Want goal-based robo-advising across multiple goals: Betterment.
Most side-hustlers end up with a stack: a SEP IRA at Fidelity for the retirement layer, plus a consumer app for the spend-driven or round-up layer. That's a legitimate setup — the apps don't conflict. For broader context, see the broader auto-investing app ranking.
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Frequently asked
- What's the best investing app if my income varies month to month?
- Apps with no monthly subscription. A $5/month subscription on a $0 contribution month is still $5. Slyce ($0/month) and Robinhood ($0/month base) don't penalize zero-contribution months. Subscription apps (Acorns, Stash, Betterment) charge regardless of whether you contributed, which is structurally inefficient for irregular income.
- Should I open a SEP IRA?
- If you have any self-employment income, a SEP IRA is a uniquely high-leverage account. The contribution limit is up to ~25% of net self-employment income (subject to an annual cap), which is much higher than a Roth IRA. Open at Fidelity, Schwab, or Vanguard with no monthly fee. Contributions are tax-deductible against self-employment income — meaningful at the 15.3% self-employment tax rate plus regular income tax.
- Should I invest my tax reserve?
- No. Side-hustlers owe quarterly estimated taxes; the IRS expects payment four times per year. Money you'll need for taxes belongs in a high-yield savings account, not a brokerage account where it could decline before tax day. Investing the tax reserve and being short on April 15 is a worse outcome than missing some return.
- How does spend-to-own work for irregular income?
- Slyce triggers fractional-share buys per eligible purchase, not per month. If your spending varies with your income, Slyce naturally invests more in months when you spend more. There's no minimum contribution and no commitment to a monthly amount.
- What if my side hustle becomes my main job?
- The transition mostly affects retirement-account contributions — a SEP IRA contribution limit scales with self-employment income, so a higher self-employment year allows higher contributions. Other accounts (taxable, Roth IRA) work the same regardless of employment status. The biggest practical change is a switch from quarterly estimated taxes (which you were doing as a side-hustler) to a more involved schedule.
Keep reading
Slyce Editorial
Published May 3, 2026 · Updated May 3, 2026