diff --git a/myteamwallet_backend/src/cashbox-export/cashbox-export.service.spec.ts b/myteamwallet_backend/src/cashbox-export/cashbox-export.service.spec.ts
new file mode 100644
index 0000000..26f736e
--- /dev/null
+++ b/myteamwallet_backend/src/cashbox-export/cashbox-export.service.spec.ts
@@ -0,0 +1,60 @@
+import { NotFoundException } from '@nestjs/common';
+import { TeamRolesEnum } from '../team-roles/team-roles.enum';
+import { CashboxExportService } from './cashbox-export.service';
+
+describe('CashboxExportService', () => {
+  const teamRepository = { findOne: jest.fn() };
+  const access = { assertAtLeast: jest.fn() };
+  let service: CashboxExportService;
+
+  const team = {
+    id: 5,
+    name: 'Team A',
+    alias: 'team-a',
+    transactions: [
+      { date: '2026-08-05T00:00:00.000Z', amount: 10, note: 'Sponsoring', type: { name: 'credit' } },
+    ],
+    players: [],
+  };
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    teamRepository.findOne.mockResolvedValue(team);
+    service = new CashboxExportService(teamRepository as any, access as any);
+  });
+
+  it('checks permission before loading data', async () => {
+    await service.exportForUser(5, 42, '2026-08-01', '2026-08-31', 'csv');
+
+    expect(access.assertAtLeast).toHaveBeenCalledWith(
+      42,
+      5,
+      'transaction_create_min_role',
+      TeamRolesEnum.scnd_treasurer,
+    );
+  });
+
+  it('throws NotFoundException for an unknown team', async () => {
+    teamRepository.findOne.mockResolvedValue(null);
+
+    await expect(
+      service.exportForUser(999, 42, '2026-08-01', '2026-08-31', 'csv'),
+    ).rejects.toBeInstanceOf(NotFoundException);
+  });
+
+  it('builds a CSV buffer with the correct content type and filename', async () => {
+    const result = await service.exportForUser(5, 42, '2026-08-01', '2026-08-31', 'csv');
+
+    expect(result.contentType).toBe('text/csv; charset=utf-8');
+    expect(result.filename).toBe('kassenbuch_team-a_2026-08-01_2026-08-31.csv');
+    expect(result.buffer.toString('utf-8')).toContain('Sponsoring');
+  });
+
+  it('builds a PDF buffer with the correct content type and filename', async () => {
+    const result = await service.exportForUser(5, 42, '2026-08-01', '2026-08-31', 'pdf');
+
+    expect(result.contentType).toBe('application/pdf');
+    expect(result.filename).toBe('kassenbuch_team-a_2026-08-01_2026-08-31.pdf');
+    expect(result.buffer.subarray(0, 5).toString('utf-8')).toBe('%PDF-');
+  });
+});
diff --git a/myteamwallet_backend/src/cashbox-export/cashbox-export.service.ts b/myteamwallet_backend/src/cashbox-export/cashbox-export.service.ts
new file mode 100644
index 0000000..d377acb
--- /dev/null
+++ b/myteamwallet_backend/src/cashbox-export/cashbox-export.service.ts
@@ -0,0 +1,51 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { TeamRolesEnum } from 'src/team-roles/team-roles.enum';
+import { Team } from 'src/teams/entities/team.entity';
+import { TeamAccessService } from 'src/teams/team-access.service';
+import { Repository } from 'typeorm';
+import { buildCsv, buildPdf, buildRows } from './cashbox-export.utils';
+
+@Injectable()
+export class CashboxExportService {
+  constructor(
+    @InjectRepository(Team)
+    private readonly teamRepository: Repository<Team>,
+    private readonly access: TeamAccessService,
+  ) {}
+
+  async exportForUser(
+    teamId: number,
+    userId: number,
+    from: string,
+    to: string,
+    format: 'csv' | 'pdf',
+  ): Promise<{ buffer: Buffer; contentType: string; filename: string }> {
+    await this.access.assertAtLeast(
+      userId,
+      teamId,
+      'transaction_create_min_role',
+      TeamRolesEnum.scnd_treasurer,
+    );
+    const team = await this.teamRepository.findOne({
+      where: { id: teamId },
+      relations: ['players', 'players.transactions', 'transactions'],
+    });
+    if (!team) throw new NotFoundException('Team nicht gefunden.');
+
+    const rows = buildRows(team, from, to);
+
+    if (format === 'csv') {
+      return {
+        buffer: Buffer.from(buildCsv(rows), 'utf-8'),
+        contentType: 'text/csv; charset=utf-8',
+        filename: `kassenbuch_${team.alias}_${from}_${to}.csv`,
+      };
+    }
+    return {
+      buffer: await buildPdf(team, rows, from, to),
+      contentType: 'application/pdf',
+      filename: `kassenbuch_${team.alias}_${from}_${to}.pdf`,
+    };
+  }
+}
diff --git a/myteamwallet_backend/src/cashbox-export/dto/cashbox-export-query.dto.ts b/myteamwallet_backend/src/cashbox-export/dto/cashbox-export-query.dto.ts
new file mode 100644
index 0000000..4fadbd6
--- /dev/null
+++ b/myteamwallet_backend/src/cashbox-export/dto/cashbox-export-query.dto.ts
@@ -0,0 +1,12 @@
+import { IsDateString, IsIn } from 'class-validator';
+
+export class CashboxExportQueryDto {
+  @IsDateString()
+  from: string;
+
+  @IsDateString()
+  to: string;
+
+  @IsIn(['csv', 'pdf'])
+  format: 'csv' | 'pdf';
+}