Massachusetts LLC Tax: How LLCs Are Taxed in Massachusetts (2026)

Q: How is a Massachusetts LLC taxed?

Federal default: pass-through (single-member = disregarded entity, multi-member = partnership). Flat 5% personal income tax (9% on income over $1M).

Q: Should my Massachusetts LLC elect S-corp tax treatment?

Worthwhile once net business income exceeds roughly $40,000-$60,000/year. Below that, the payroll compliance cost outweighs the self-employment tax savings.

Q: Do non-residents owe US tax on a Massachusetts LLC?

Depends on Effectively Connected Income (ECI). LLCs without US ECI typically owe Form 5472 information filing but no income tax. With US ECI: subject to US income tax. Consult a US tax preparer.

Q: What is Form 5472 and does my Massachusetts LLC need it?

Form 5472 is required for any US-disregarded entity with 25%+ foreign ownership. Most non-resident-owned single-member LLCs must file it annually alongside a pro-forma Form 1120.

Flat 5% personal income tax (9% on income over $1M). The IRS default treatment for an LLC is pass-through — single-member LLCs are disregarded entities, multi-member LLCs are partnerships. S-corp election can save self-employment tax once net income exceeds roughly $40,000-$60,000.

By Alif Al Razi, Tax & Compliance Lead · Last updated 2026-05-21

Federal default tax treatment

Single-member LLC: disregarded entity, taxed on Schedule C of your personal 1040. Multi-member LLC: partnership, files Form 1065 and issues K-1s to members. No federal entity-level tax in either case.

Massachusetts state tax

Flat 5% personal income tax (9% on income over $1M).

S-corp election

An LLC can elect to be taxed as an S-corporation by filing Form 2553. Benefit: reasonable-salary portion of income avoids self-employment tax (15.3% saved on the non-salary portion). Becomes worthwhile around $40,000-$60,000 net annual income.

Self-employment tax

Default LLC owners pay 15.3% self-employment tax on net business income (12.4% Social Security up to $168,600 + 2.9% Medicare). S-corp election can reduce this, but adds payroll compliance complexity.

Non-resident owner tax

Non-US residents who own a US LLC must file Form 5472 + pro-forma 1120 each year if the LLC is a disregarded entity with foreign ownership. Form 1065/K-1 if multi-member. ITIN may be needed for personal tax filing. Anonymousllc.co partners with US tax preparers familiar with non-resident filings.

BOI reporting

Under the March 21, 2025 FinCEN interim final rule, domestic reporting companies are exempt from BOI reporting. Foreign reporting companies (LLCs formed outside the US) remain obligated. Most Massachusetts LLCs are domestic and currently exempt.