Key facts: Massachusetts requires a mandatory 30-day waiting period before creditors may file claims; estates valued at $50,000 or less may qualify for simplified administration procedures; creditors must submit written claims containing the claim basis, amount owed, and supporting documentation; personal representatives may allow, disallow, or require judicial determination of contested claims; claims not filed within statutory deadlines are typically permanently barred; secured creditors may pursue collateral independently of probate; funeral expenses, administration costs, and taxes receive priority over general unsecured claims.