Dek: A new IRS safe harbor is reshaping Solana staking ETFs. Grayscale and Morgan Stanley are now required to convert staking rewards into cash payouts, which means U.S. investors face an immediate tax bill instead of the compounding growth native Solana staking normally offers.
The Short Answer
Starting August 7, 2026, holders of Grayscale’s Solana Staking ETF (GSOL) will receive mandatory quarterly cash distributions rather than having staking rewards reinvested inside the fund. Grayscale confirmed this in a Form 8-K filed July 17, 2026, disclosing a Third Amended and Restated Trust Agreement for GSOL Morgan Stanley, in a July 15, 2026 S-1/A for its proposed Solana Trust (MSOL), has built a similar structure into a product that is not yet effective with the SEC, pairing a 0.14% sponsor fee with a 5% cap on staking service fees Neither filing is optional design. Both are direct responses to IRS Revenue Procedure 2025-31, issued November 10, 2025, which set the safe-harbor conditions under which a digital asset ETP can stake its holdings without losing grantor trust tax status The practical result for anyone holding a Solana staking ETF in a taxable U.S. brokerage account: expect a Form 1099-DIV each quarter, not silent compounding.
What the Filings Actually Say
GSOL’s 8-K is a corporate-governance document, not a press release. It amends the trust agreement itself. According to the filing, the trust will begin distributing staking rewards in cash on a quarterly schedule, with the first distribution dated August 7, 2026 This matters because a grantor trust cannot simply retain and reinvest income the way a corporation might; the IRS safe harbor is conditioned on income flowing through to holders in a recognizable, reportable form.
Morgan Stanley’s MSOL filing is still in the S-1 amendment stage — a proposed product awaiting SEC effectiveness, not a launched fund. The July 15, 2026 S-1/A describes a sponsor fee of 0.14%, dual custody split between BNY Mellon and Coinbase, staking of up to 100% of the trust’s SOL holdings, and a 5% cap on the fees a staking service provider can charge against rewards before they reach the trust That 0.14% headline fee is meaningfully lower than typical spot crypto ETF sponsor fees, and it signals the fee-compression pressure now spreading into staking-enabled products specifically.
Grayscale’s own current staking-fee schedule for GSOL was not detailed in the portion of the 8-K reviewed for this article. That is a real gap, not a stylistic omission — readers comparing “cost of staking” across GSOL and MSOL should treat any specific Grayscale staking-fee percentage circulating in secondary commentary as unconfirmed until Grayscale publishes it in a primary filing.
Why the IRS Rule Forces This Structure
Revenue Procedure 2025-31 exists because staking, unlike simply holding an asset, generates new income at the protocol level. A grantor trust’s tax-advantaged, pass-through status depends on the trust not behaving like an actively managed investment company. The safe harbor lets ETPs stake without triggering that reclassification risk — but only if reward income is converted to cash and distributed on a set schedule rather than compounded inside the fund
This is the structural trade-off at the center of the current Solana staking ETF race. In this analysis, the safe harbor solves an IRS compliance problem for the issuer, but it shifts a tax-timing problem onto the shareholder. Native Solana staking, done directly through a wallet or exchange, lets rewards accrue and compound without a forced sale or forced income recognition event tied to a fixed calendar date. A grantor trust operating under Revenue Procedure 2025-31 cannot offer that same deferral, because deferral is exactly what the safe harbor is designed to prevent.
The Mechanics Gap: Cash In, Tax Bill Out
Here is where public coverage of GSOL and MSOL has largely stopped at the headline. The 8-K and S-1/A confirm that distributions will happen and on what schedule, and MSOL’s filing confirms a 5% cap on staking service fees What neither filing spells out in the sections reviewed here is the granular operational path — for example, exactly when in the quarter SOL rewards are converted to cash, or how a validator slashing event mid-quarter would flow through to the distribution amount. That level of detail typically appears in a fund’s statutory prospectus or annual report rather than an 8-K or S-1 amendment, and it had not surfaced in the documents available for this article.
What is clear from the structure itself: shareholders will owe ordinary income tax on distributed staking rewards in the year received, regardless of whether they reinvest the cash or whether GSOL/MSOL shares have gone up or down in price over that period. A falling share price and a taxable distribution can occur in the same quarter — the two are not linked. This is a mechanical feature of how grantor trust distributions are taxed, not a prediction about where SOL’s price or staking yield is headed.
Who Feels This First
U.S. taxable brokerage accounts are the most directly affected group, since IRA and other tax-deferred accounts do not recognize the quarterly distributions as current income in the same way. Non-U.S. holders face a separate and less-documented question: withholding tax treatment on distributions from a U.S. grantor trust holding staked digital assets is a newer fact pattern than traditional REIT or bond-fund distributions, and neither the GSOL 8-K nor the MSOL S-1/A reviewed here specifies cross-border withholding mechanics in detail. Readers with non-U.S. tax residency should treat this as an open question requiring their own tax advisor, not something this filing pair resolves.
What We Don’t Know
Several material questions remain unanswered by the primary documents reviewed for this article. Grayscale’s current staking-fee percentage for GSOL was not confirmed in the 8-K excerpt available, so any specific number should be treated as unverified until Grayscale discloses it directly. The exact operational timing of SOL-to-cash conversion within each quarter, and how a slashing event would be allocated across the distribution, were not detailed in either filing reviewed. Morgan Stanley’s MSOL remains an amended S-1 — a proposal awaiting SEC effectiveness — not an approved or trading product, so its fee structure and staking terms could still change before any launch. This article does not predict whether the SEC will declare the S-1 effective, on what timeline, or in what final form.
Not Tax or Investment Advice
This article is informational commentary based on public SEC filings and an IRS revenue procedure. It is not tax, legal, or investment advice, and it does not recommend buying, selling, or holding any ETF, trust, or digital asset. Tax treatment of ETF distributions varies by individual circumstance, account type, and residency. Readers should consult a licensed tax professional or financial advisor before making decisions related to Solana staking ETFs or any staking-linked product.
Next Watchpoint
The next concrete date to track is August 7, 2026, GSOL’s first mandated quarterly distribution under the amended trust agreement — the actual per-share cash amount and Form 1099-DIV characterization will show how the mechanics work in practice rather than in filing language. Separately, watch for the SEC’s action on Morgan Stanley’s MSOL S-1/A; until the SEC declares it effective, the 0.14% fee and 5% staking-fee cap remain proposed terms, not final ones.
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