diff --git a/src/transactions/dto.ts b/src/transactions/dto.ts
new file mode 100644
index 0000000..0ae9178
--- /dev/null
+++ b/src/transactions/dto.ts
@@ -0,0 +1,50 @@
+import { IsIn, IsISO8601, IsInt, IsOptional, IsString, IsUUID, Length, Min } from 'class-validator';
+
+export const EVIDENCE_STATUSES = ['missing', 'partial', 'complete', 'not_required'] as const;
+export type EvidenceStatusValue = (typeof EVIDENCE_STATUSES)[number];
+
+export class CreateTransactionDto {
+  @IsUUID()
+  organizationId!: string;
+
+  @IsString()
+  @Length(1, 64)
+  type!: string;
+
+  /** Valoarea in unitati minore (ex: bani in centi). NU se admit zecimale. */
+  @IsInt()
+  @Min(0)
+  amountMinorUnits!: number;
+
+  @IsString()
+  @Length(3, 3)
+  currency!: string;
+
+  @IsISO8601()
+  transactionDate!: string;
+
+  @IsOptional()
+  @IsIn(EVIDENCE_STATUSES as unknown as string[])
+  evidenceStatus?: EvidenceStatusValue;
+
+  @IsOptional()
+  @IsString()
+  @Length(1, 255)
+  source?: string;
+}
+
+export class UpdateTransactionDto {
+  @IsOptional()
+  @IsIn(EVIDENCE_STATUSES as unknown as string[])
+  evidenceStatus?: EvidenceStatusValue;
+
+  @IsOptional()
+  @IsString()
+  @Length(1, 64)
+  type?: string;
+
+  @IsOptional()
+  @IsString()
+  @Length(1, 255)
+  source?: string;
+}