A Massachusetts LLC pays a flat 5% state income tax on pass-through profit, rising to 9% on income above $1M under the millionaire surtax. The IRS default is pass-through: single-member LLCs are disregarded entities, multi-member LLCs are partnerships. An S-corporation election saves self-employment tax once net income passes $40,000-$60,000. Non-resident owners with no US effectively connected income owe no US federal income tax but file Form 5472 each year.
By default the IRS taxes a single-member Massachusetts LLC as a disregarded entity on Schedule C of the owner's Form 1040, and a multi-member LLC as a partnership filing Form 1065 with K-1s to each member. There is no federal entity-level tax in either case. Profit passes through to the owners and is taxed at their individual rates. The LLC itself files an information return, not a tax-paying return, unless it elects corporate treatment. This pass-through default is what makes the LLC simpler than a C-corporation, which faces tax at both the entity and shareholder level.
Massachusetts applies a flat 5% personal income tax to an LLC owner's distributive share of pass-through profit, rising to 9% on income above $1M through the millionaire surtax enacted by the Commonwealth. An owner reporting income below $1M pays the flat 5% rate on the LLC's pass-through profit. Income above the $1M threshold carries the additional 4% surtax, for a 9% top rate on the portion over $1M. Massachusetts taxes residents on all pass-through income and non-residents on the share sourced to Massachusetts. The LLC pays no separate state income tax under the default pass-through treatment.
An LLC elects S-corporation treatment by filing IRS Form 2553, which lets the owner take a reasonable salary and draw the remaining profit as distributions that avoid the 15.3% self-employment tax. The election becomes worthwhile once net income passes $40,000-$60,000. Below that range, the payroll compliance cost of running an S-corp outweighs the self-employment tax saved. Above it, the savings on the non-salary distribution portion exceed the added cost. Massachusetts recognizes the federal S-corp election for state purposes and applies its income tax to the pass-through income. Anonymousllc.co connects owners with US tax preparers who model the breakeven.
Default LLC owners pay 15.3% self-employment tax on net business income: 12.4% Social Security up to the annual wage base of $168,600 and 2.9% Medicare with no cap. This is separate from federal and Massachusetts income tax. The self-employment tax funds Social Security and Medicare, which W-2 employees split with an employer. An LLC owner covers both halves. An S-corporation election reduces this by moving the non-salary distribution portion outside the self-employment base, at the cost of running payroll. Non-resident owners with no US self-employment income and no US effectively connected income are outside this tax.
Non-US residents who own a US LLC file Form 5472 with a pro-forma Form 1120 each year if the LLC is a foreign-owned disregarded entity, or Form 1065 with K-1s if multi-member. Whether US income tax applies depends on effectively connected income. An LLC with no US effectively connected income owes the Form 5472 information filing but no US federal income tax on foreign-earned profit. An LLC with US effectively connected income is subject to US income tax on that income. An ITIN may be needed for the owner's personal filing. Anonymousllc.co partners with US tax preparers familiar with non-resident filings.
Form 5472 is an IRS information return required for any US disregarded entity with 25% or more foreign ownership. Most non-resident-owned single-member Massachusetts LLCs must file it annually alongside a pro-forma Form 1120. The form reports reportable transactions between the LLC and its foreign owner, such as capital contributions and distributions. The penalty for failing to file starts at $25,000, so it is a filing non-resident owners cannot skip. The form is an information return, not a tax payment; a foreign-owned LLC with no US effectively connected income files it without owing US income tax.
An owner reporting $1.5M in pass-through income pays Massachusetts 5% on the first $1M and 9% on the $500,000 above the $1M threshold at the state level. The 9% reflects the flat 5% plus the 4% millionaire surtax. That produces $50,000 on the first $1M and $45,000 on the next $500,000, for $95,000 in Massachusetts income tax before federal tax and self-employment tax. The surtax applies only to the portion above $1M, not the entire amount. Federal income tax and, for default LLCs, self-employment tax apply separately on top of the state figure.
Yes. An LLC elects C-corporation treatment by filing IRS Form 8832, after which the LLC pays the 21% federal corporate tax and enters the Massachusetts corporate excise regime with its own minimum tax and rate. C-corp treatment suits founders raising venture capital or retaining earnings inside the company, and it separates corporate profit from the owner's personal return. The tradeoff is tax at both the corporate level and again on dividends. Most small Massachusetts LLCs keep the default pass-through or elect S-corp treatment instead. Anonymousllc.co connects owners with tax preparers who model the corporate election against the alternatives.
No, as the rule stands. Under the March 21, 2025 FinCEN interim final rule, domestic reporting companies are exempt from beneficial ownership information reporting. Most Massachusetts LLCs are domestic and currently exempt. Foreign reporting companies formed outside the United States and registered in a US state remain obligated to file each BOI report. A Massachusetts LLC formed in Massachusetts falls under the domestic exemption. Anonymousllc.co monitors FinCEN changes and files BOI reports at $150 per report when an entity is obligated, so an owner is covered if the rule shifts.
An ITIN is needed when a non-resident owner has a personal US tax filing obligation, such as US effectively connected income flowing through the LLC. The LLC itself uses an EIN, which non-residents obtain by fax without an SSN in 5-7 days. Anonymousllc.co provides ITIN service for $299 when a personal filing requires it. A non-resident owner with no US effectively connected income handles the LLC's Form 5472 filing with the EIN alone and does not need an ITIN. The tax preparer confirms whether the owner's specific situation triggers a personal filing that requires the ITIN.
A Massachusetts LLC owner pays estimated taxes quarterly on pass-through profit because no employer withholds tax from distributions. Estimated payments go to the IRS for federal income and self-employment tax and to Massachusetts for the 5% state income tax. The federal quarterly deadlines fall in April, June, September, and January, and Massachusetts follows the same schedule. An owner who takes an S-corp election runs payroll and withholds tax from the salary portion, which reduces the estimated-payment burden on that share. Underpaying the quarterly estimates triggers an IRS and a Massachusetts underpayment penalty, so owners calculate the payments from projected annual profit. Anonymousllc.co connects owners with US tax preparers who set the quarterly estimate amounts and confirm the Massachusetts and federal filing calendar, so a non-resident or first-year owner does not miss a deadline.
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