diff --git a/common/proto/accounting.proto b/common/proto/accounting.proto
index 10fc82a..78c30a4 100644
--- a/common/proto/accounting.proto
+++ b/common/proto/accounting.proto
@@ -63,6 +63,22 @@ enum AccountingPeriodStatus {
   ACCOUNTING_PERIOD_STATUS_APPROVED = 3;
 }
 
+// How long one accounting period lasts. MONTH and YEAR span whole months, so
+// the caller states only the start and the end is derived. PARTIAL is the
+// exception for periods real life cut short.
+enum AccountingPeriodType {
+  ACCOUNTING_PERIOD_TYPE_UNSPECIFIED = 0;
+  // One calendar month.
+  ACCOUNTING_PERIOD_TYPE_MONTH = 1;
+  // Twelve consecutive months, aligned to the profile's fiscal year. Starting
+  // in January gives the calendar year; any other start month gives a business
+  // year (hospodársky rok).
+  ACCOUNTING_PERIOD_TYPE_YEAR = 2;
+  // Neither a whole month nor a whole year, because the entity was formed or
+  // terminated part-way through one. The only type carrying an explicit end.
+  ACCOUNTING_PERIOD_TYPE_PARTIAL = 3;
+}
+
 message PostJournalRequest {
   string profile_name = 1;
 
@@ -244,11 +260,16 @@ message Journal {
 
 message ConfigureAccountingPeriodRequest {
   string profile_name = 1;
-  // Inclusive range in YYYY-MM-DD.
+  // First day of the period, YYYY-MM-DD. Must be the first day of a month.
   string period_start = 2;
-  string period_end = 3;
+  reserved 3;
   // Optional link to the preceding period in a carry chain.
   optional int64 previous_period_id = 4;
+  // Required. Decides the length of the period.
+  AccountingPeriodType period_type = 5;
+  // Last day of the period, YYYY-MM-DD. Required for PARTIAL and rejected for
+  // every other type, whose end follows from the start.
+  string period_end = 6;
 }
 
 message CloseAccountingPeriodRequest {
@@ -286,6 +307,7 @@ message AccountingPeriod {
   string closed_by_user_id = 8;
   string approved_at = 9;
   string approved_by_user_id = 10;
+  AccountingPeriodType period_type = 11;
 }
 
 message ListPeriodBalancesRequest {
diff --git a/common/proto/table_definition.proto b/common/proto/table_definition.proto
index ec65284..ec44c56 100644
--- a/common/proto/table_definition.proto
+++ b/common/proto/table_definition.proto
@@ -89,6 +89,20 @@ message PostTableDefinitionRequest {
   // Column whose value identifies a row to users in pickers. "id" is always
   // valid; otherwise this must name one of the user-defined columns above.
   string row_display_column = 7;
+
+  // ISO-4217 currency the profile keeps its accounting in. A profile is one
+  // accounting entity and keeps one set of books, so this is required only when
+  // the request creates the profile, and is ignored afterwards. It is unrelated
+  // to base_currency: tables may hold money in any currency, and amounts convert
+  // to this one when they reach the ledger.
+  string accounting_currency = 8;
+
+  // Month the profile's fiscal year begins, 1-12. Like accounting_currency,
+  // this describes the entity rather than the table, so it is required only
+  // when the request creates the profile and ignored afterwards. January means
+  // the calendar year; any other month means a business year (hospodársky
+  // rok), which may be used only after notifying the tax office.
+  uint32 fiscal_year_start_month = 9;
 }
 
 // Defines the input for explicitly creating a table backed by one invoice
diff --git a/common/src/proto/descriptor.bin b/common/src/proto/descriptor.bin
index 2c09d32..1b1555e 100644
Binary files a/common/src/proto/descriptor.bin and b/common/src/proto/descriptor.bin differ
diff --git a/common/src/proto/komp_ac.accounting.rs b/common/src/proto/komp_ac.accounting.rs
index d92a5e7..247f35c 100644
--- a/common/src/proto/komp_ac.accounting.rs
+++ b/common/src/proto/komp_ac.accounting.rs
@@ -256,14 +256,19 @@ pub struct Journal {
 pub struct ConfigureAccountingPeriodRequest {
     #[prost(string, tag = "1")]
     pub profile_name: ::prost::alloc::string::String,
-    /// Inclusive range in YYYY-MM-DD.
+    /// First day of the period, YYYY-MM-DD. Must be the first day of a month.
     #[prost(string, tag = "2")]
     pub period_start: ::prost::alloc::string::String,
-    #[prost(string, tag = "3")]
-    pub period_end: ::prost::alloc::string::String,
     /// Optional link to the preceding period in a carry chain.
     #[prost(int64, optional, tag = "4")]
     pub previous_period_id: ::core::option::Option<i64>,
+    /// Required. Decides the length of the period.
+    #[prost(enumeration = "AccountingPeriodType", tag = "5")]
+    pub period_type: i32,
+    /// Last day of the period, YYYY-MM-DD. Required for PARTIAL and rejected for
+    /// every other type, whose end follows from the start.
+    #[prost(string, tag = "6")]
+    pub period_end: ::prost::alloc::string::String,
 }
 #[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
 pub struct CloseAccountingPeriodRequest {
@@ -317,6 +322,8 @@ pub struct AccountingPeriod {
     pub approved_at: ::prost::alloc::string::String,
     #[prost(string, tag = "10")]
     pub approved_by_user_id: ::prost::alloc::string::String,
+    #[prost(enumeration = "AccountingPeriodType", tag = "11")]
+    pub period_type: i32,
 }
 #[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
 pub struct ListPeriodBalancesRequest {
@@ -407,6 +414,47 @@ impl AccountingPeriodStatus {
         }
     }
 }
+/// How long one accounting period lasts. MONTH and YEAR span whole months, so
+/// the caller states only the start and the end is derived. PARTIAL is the
+/// exception for periods real life cut short.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, ::prost::Enumeration)]
+#[repr(i32)]
+pub enum AccountingPeriodType {
+    Unspecified = 0,
+    /// One calendar month.
+    Month = 1,
+    /// Twelve consecutive months, aligned to the profile's fiscal year. Starting
+    /// in January gives the calendar year; any other start month gives a business
+    /// year (hospodársky rok).
+    Year = 2,
+    /// Neither a whole month nor a whole year, because the entity was formed or
+    /// terminated part-way through one. The only type carrying an explicit end.
+    Partial = 3,
+}
+impl AccountingPeriodType {
+    /// String value of the enum field names used in the ProtoBuf definition.
+    ///
+    /// The values are not transformed in any way and thus are considered stable
+    /// (if the ProtoBuf definition does not change) and safe for programmatic use.
+    pub fn as_str_name(&self) -> &'static str {
+        match self {
+            Self::Unspecified => "ACCOUNTING_PERIOD_TYPE_UNSPECIFIED",
+            Self::Month => "ACCOUNTING_PERIOD_TYPE_MONTH",
+            Self::Year => "ACCOUNTING_PERIOD_TYPE_YEAR",
+            Self::Partial => "ACCOUNTING_PERIOD_TYPE_PARTIAL",
+        }
+    }
+    /// Creates an enum from field names used in the ProtoBuf definition.
+    pub fn from_str_name(value: &str) -> ::core::option::Option<Self> {
+        match value {
+            "ACCOUNTING_PERIOD_TYPE_UNSPECIFIED" => Some(Self::Unspecified),
+            "ACCOUNTING_PERIOD_TYPE_MONTH" => Some(Self::Month),
+            "ACCOUNTING_PERIOD_TYPE_YEAR" => Some(Self::Year),
+            "ACCOUNTING_PERIOD_TYPE_PARTIAL" => Some(Self::Partial),
+            _ => None,
+        }
+    }
+}
 /// Generated client implementations.
 pub mod accounting_client {
     #![allow(
diff --git a/common/src/proto/komp_ac.table_definition.rs b/common/src/proto/komp_ac.table_definition.rs
index 4c4be5a..2b45fe2 100644
--- a/common/src/proto/komp_ac.table_definition.rs
+++ b/common/src/proto/komp_ac.table_definition.rs
@@ -49,6 +49,20 @@ pub struct PostTableDefinitionRequest {
     /// valid; otherwise this must name one of the user-defined columns above.
     #[prost(string, tag = "7")]
     pub row_display_column: ::prost::alloc::string::String,
+    /// ISO-4217 currency the profile keeps its accounting in. A profile is one
+    /// accounting entity and keeps one set of books, so this is required only when
+    /// the request creates the profile, and is ignored afterwards. It is unrelated
+    /// to base_currency: tables may hold money in any currency, and amounts convert
+    /// to this one when they reach the ledger.
+    #[prost(string, tag = "8")]
+    pub accounting_currency: ::prost::alloc::string::String,
+    /// Month the profile's fiscal year begins, 1-12. Like accounting_currency,
+    /// this describes the entity rather than the table, so it is required only
+    /// when the request creates the profile and ignored afterwards. January means
+    /// the calendar year; any other month means a business year (hospodársky
+    /// rok), which may be used only after notifying the tax office.
+    #[prost(uint32, tag = "9")]
+    pub fiscal_year_start_month: u32,
 }
 /// Defines the input for explicitly creating a table backed by one invoice
 /// template. typst_source must contain exactly one declaration of the form:
diff --git a/graphs/src/pages/add_table/state.rs b/graphs/src/pages/add_table/state.rs
index d6fe457..173f952 100644
--- a/graphs/src/pages/add_table/state.rs
+++ b/graphs/src/pages/add_table/state.rs
@@ -114,6 +114,8 @@ impl CreateTableForm {
         }
 
         Ok(PostTableDefinitionRequest {
+            accounting_currency: String::new(),
+            fiscal_year_start_month: 0,
             table_name,
             links,
             columns,
diff --git a/server b/server
index 454acc6..14346db 160000
--- a/server
+++ b/server
@@ -1 +1 @@
-Subproject commit 454acc6f2b0286b165188236f64b436dfa4a5555
+Subproject commit 14346dbc36b29731c01d0be631e156f456bb82a5