diff --git a/conservancy_beancount/data.py b/conservancy_beancount/data.py
index 614034ef7ae897814fd7af26a4ef13c9e9285609..28c587f14ce2ff9b323e5c45e892deb71894e5b6 100644
--- a/conservancy_beancount/data.py
+++ b/conservancy_beancount/data.py
@@ -30,6 +30,7 @@ from beancount.core import amount as bc_amount
 from beancount.core import convert as bc_convert
 from beancount.core import data as bc_data
 from beancount.core import position as bc_position
+from beancount.parser import options as bc_options
 
 from typing import (
     cast,
@@ -40,6 +41,7 @@ from typing import (
     Iterator,
     MutableMapping,
     Optional,
+    Pattern,
     Sequence,
     TypeVar,
     Union,
@@ -53,6 +55,7 @@ from .beancount_types import (
     MetaKey,
     MetaValue,
     Open,
+    OptionsMap,
     Posting as BasePosting,
     Transaction,
 )
@@ -153,8 +156,19 @@ class Account(str):
     """
     __slots__ = ()
 
+    ACCOUNT_RE: Pattern
     SEP = bc_account.sep
     _meta_map: MutableMapping[str, AccountMeta] = {}
+    _options_map: OptionsMap
+
+    @classmethod
+    def load_options_map(cls, options_map: OptionsMap) -> None:
+        cls._options_map = options_map
+        roots: Sequence[str] = bc_options.get_account_types(options_map)
+        cls.ACCOUNT_RE = re.compile(
+            r'^(?:{})(?:{}[A-Z0-9][-A-Za-z0-9]*)+$'.format(
+                '|'.join(roots), cls.SEP,
+            ))
 
     @classmethod
     def load_opening(cls, opening: Open) -> None:
@@ -178,6 +192,10 @@ class Account(str):
             elif isinstance(entry, bc_data.Close):
                 cls.load_closing(entry)  # type:ignore[arg-type]
 
+    @classmethod
+    def is_account(cls, s: str) -> bool:
+        return cls.ACCOUNT_RE.fullmatch(s) is not None
+
     @property
     def meta(self) -> AccountMeta:
         return self._meta_map[self]
@@ -286,6 +304,7 @@ class Account(str):
             return self
         else:
             return self[:stop]
+Account.load_options_map(bc_options.OPTIONS_DEFAULTS)
 
 
 class Amount(bc_amount.Amount):