Where Massachusetts differs
Federal and Massachusetts compared
MSLAW is a Massachusetts school and the chart cites G.L. c. 234 § 34A, so state practice is plausibly in scope. Confirm with Prof. Coyne before relying on it.
Casebook: Hazard, Fletcher, Bundy & Bradt, Pleading and Procedure (12th ed.). The syllabus skips Pennoyer and Harris v. Balk and begins at International Shoe, p. 58. Outline draft due 10.5.26; midterm 10.7.26.
A federal court sitting in Massachusetts applies federal procedural rules. It does not switch to the state rules because Massachusetts substantive law governs the claim. These differences matter when you are in state court — or when habit carries a federal deadline into a state filing.
Comparison desk
Ordinary-rule starting points, not a docket calculator. Check exclusions, service method, court orders, and whether the rule counts from service or filing. Do not compute a Massachusetts ten-day period with federal Rule 6 arithmetic out of habit.
| Question | Federal baseline | Massachusetts | Source |
|---|---|---|---|
| Ordinary answer after original service | 21 days | 20 days | Rules 12; |
| Response after denial/postponement of Rule 12 motion | Ordinarily 14 days after notice | Ordinarily 10 days after notice | |
| Jury demand | 14 days after last pleading directed to issue | 10 days | |
| Impleader without leave | File within 14 days after serving original answer | Serve within 20 days after serving original answer | |
| Amendment as of course | Rule 15(a)(1)'s 21-day windows | Before responsive pleading and dismissal order; separate 20-day route for a pleading without a permitted response | |
| Party-change relation back | Notice/mistake requirements under 15(c)(1)(C); also assess (A) | Different, broader text expressly including a change of party | |
| Signing/sanctions | Reasonable inquiry; party-motion safe harbor ordinarily 21 days | Different certification text; no equivalent safe harbor in state Rule 11 | |
| Class structure | Rule 23(a), then (b)(1), (b)(2), or (b)(3) | Rule 23(a), then state (b)'s predominance/superiority test; special statutes may matter | |
| Discovery scope | Claim/defense relevance and proportionality | State subject-matter wording, limitations, and protective-order framework | |
| Interrogatory count | Ordinarily 25, including discrete subparts | Ordinarily 30 under state formulation | |
| Medical/mental examiner | Suitably licensed or certified | Same category adopted in 2023 amendment | |
| Civil verdict agreement | Unanimous absent stipulation | Five-sixths | |
| Renewed JMOL / JNOV | Ordinarily file within 28 days of judgment | Ordinarily serve within 10 days; state preservation requirements differ | |
| New-trial motion | File within 28 days of judgment | Serve within 10 days | |
| Without-notice TRO duration | Ordinarily no more than 14 days initially | Ordinarily no more than 10 days initially |
Every Massachusetts note, by stage
The 50 rule entries that carry a state difference, collected. Each links back to the full entry.
A. Choosing and entering the court
Massachusetts Rule 6 has a different short-period computation convention; do not copy federal arithmetic.
Massachusetts state courts are not Article III courts; federal standing formulations should not be silently substituted for Massachusetts standing law.
Massachusetts state subject matter jurisdiction does not require diversity and depends on the court's statutory competence, not this federal threshold.
In Massachusetts, SCVNGR requires an independent long-arm inquiry before constitutional analysis.
Massachusetts state venue uses its own statutes, including G.L.
State law governing liability does not bring all Massachusetts civil rules into federal court.
Hanna itself arose from competing federal and Massachusetts service requirements.
B. Pleadings, notice, and early decisions
Massachusetts adopted a plausibility formulation in Iannacchino; it is state precedent, not automatic incorporation of every later federal pleading decision.
Massachusetts has corresponding Rules 9 and 17; do not confuse either inquiry with subject matter jurisdiction.
Massachusetts Rule 11 uses materially different certification and enforcement language and does not contain the federal 21-day safe harbor.
Massachusetts Rule 38 uses a 10-day demand period and the Commonwealth's constitutional/statutory foundation.
Massachusetts Rule 65 places TRO provisions in subsection (a), ordinarily uses 10 days, and expressly permits good-cause relief from security.
Packaging Industries frames the Massachusetts preliminary-injunction balance.
Massachusetts Rule 4 has its own authorized-server provisions and Rule 4(j)'s 90-day framework; it should not be replaced wholesale with federal Rule 4.
Massachusetts ordinarily uses 20 days to respond and 10 days after notice of denial/postponement of a Rule 12 motion, rather than the federal 14-day post-motion period.
Massachusetts conversion language appears within its Rule 12(b)/(c), not a federal-style Rule 12(d) subdivision.
Massachusetts Rule 8 follows the same broad separation; use its text and local authority for specific consequences.
Massachusetts Rule 15 uses different amendment timing and expressly broader party-change relation-back wording.
Massachusetts Rule 55 has its own procedures; Rule 55.1 adds special requirements for certain consumer-debt defaults.
C. Structuring parties and claims
Massachusetts Rule 13 has its own text and court-specific provisions; identify the state court and check the operative subdivision before assuming identical compulsory treatment.
Massachusetts Rule 14 instead permits impleader without leave when the third-party complaint is served within 20 days after the original answer is served.
Massachusetts Rule 19 supplies the state procedural test.
Massachusetts Rule 23 has a different structure: its (b) requires predominance and superiority; do not import the federal three-category scheme.
Massachusetts Rule 22 is a state procedural vehicle; federal statutory jurisdiction and nationwide process do not follow it into state court.
Massachusetts has corresponding but independently worded rules.
D. Developing the record
Massachusetts Rule 26 does not impose the same universal federal initial-disclosure/Rule 26(f) scheme; standing orders and case-specific directions are essential.
Massachusetts Rule 26 retains different subject-matter language while providing limitations and protective orders; federal wording should not be copied into a Massachusetts rule quotation.
Massachusetts expert disclosure and discovery mechanisms differ from automatic federal report practice.
Massachusetts Rule 33 uses a 30-interrogatory framework and its own enforcement procedures, so federal limits and default consequences are not portable.
Massachusetts Rule 34 also addresses ESI and inspection, but its precise response language controls in state court.
Massachusetts Rule 30 was amended in 2025; consult its current text and Rule 30A rather than assume every federal recording or duration provision applies.
Massachusetts rules and local orders must be checked separately for a state deposition.
Rule texts supply the mechanics; Massachusetts has corresponding Rules 31–32.
Massachusetts amended Rule 35 in 2023 to use a suitably licensed or certified examiner following Ashe; the outdated assumption that the examiner must fit a narrow physician category should not control the exercise.
Massachusetts uses its own Rule 36; the procedural effect is different from an ordinary discovery answer.
Massachusetts subpoena practice is governed by its own Rule 45 and applicable interstate process, not automatic nationwide federal authority.
Massachusetts Rule 37 has its own text and procedures; do not import the federal disclosure-exclusion machinery without checking.
Physical evidence and Massachusetts spoliation require their own authority.
Kippenhan is a Massachusetts physical-evidence anchor, not a substitute for federal Rule 37(e).
E. Decisions on the record and at trial
Massachusetts Kourouvacilis asks whether the opponent has a reasonable expectation of proving an essential element.
Massachusetts G.L.
234A, §68B permits five-sixths agreement; Massachusetts Rule 48 addresses its own jury arrangements.
Massachusetts Rule 49 has corresponding devices; timely objections and the governing appellate cases matter.
Massachusetts Rule 51 also governs argument and instruction practice and uses its own preservation language.
Massachusetts calls its mechanism a directed verdict and specifies its own points for making the motion.
Massachusetts JNOV uses a 10-day service deadline and a directed-verdict motion at the close of all evidence.
Massachusetts Rule 52 differs in organization and includes District Court/BMC provisions; its subsection (c) is not the federal judgment-on-partial-findings rule.
F. Ending, revisiting, and enforcing the case
Massachusetts Rule 58 and its appellate rules govern state timing independently.
Massachusetts Rule 41 must be checked separately.
Massachusetts Rule 59 ordinarily requires service within 10 days; do not treat that as the federal filing deadline.
Massachusetts Rule 60 is an independent text; its filing does not automatically suspend enforcement or reset appeal time.
Massachusetts appellate Rule 4 separately governs state appeals; post-trial service/filing and tolling requirements must be read together.
Massachusetts Kobrin distinguishes the two doctrines under state law.
Massachusetts has its own stay/execution rules; do not assume federal timing.