CNSF Actuario Pensiones common mistakes
CNSF Actuario Pensiones · Understand the traps and how to avoid them.
Applying the contribución definida logic (individual account balance, aportaciones, rendimiento) to a beneficio definido valuation, or vice versa, when the question describes a plan with a guaranteed pension expressed as a formula of salario and años de servicio.
The two plan families dominate the exam and share vocabulary (reserva, aportación, tasa), so candidates pattern-match on keywords instead of first identifying who bears the investment and longevity risk.
What to do instead
Before computing anything, write one line: 'quién soporta el riesgo de inversión y de longevidad'. If the employer/aseguradora bears it and the benefit is a formula, use BD methodology (beneficio proyectado, método de costeo, pasivo por beneficios devengados). If the balance determines the benefit, use CD (proyección de aportaciones y rendimientos, tasa de reemplazo esperada).
Using a single tasa de descuento or a single mortality table without stating or justifying the supuesto, and without checking whether the question requires a tasa técnica vs. una tasa de mercado.
Candidates memorize formulas with a generic 'i' and skip the assumption-selection step that the exam tests explicitly; the CNSF framework distinguishes the tasa de interés técnico from valuation discount rates used for reporting.
What to do instead
For every valuation item, explicitly list the supuestos used: tabla de mortalidad (y si es de rentistas o de población general), tasa de interés técnico, tasa de rotación, crecimiento salarial, gastos. State the source and justify why it is prudent. If the question gives a tasa técnica, do not substitute a market rate.
Computing a reserva técnica without distinguishing reserva de riesgos en curso, reserva matemática de pensiones y reserva de previsión, or netting them into one number.
The reserva terminology overlaps across ramos de vida and pensiones, and candidates collapse them into a single 'reserva' figure because they never built a mental map of the LISF/Solvencia II-style balance sheet.
What to do instead
Build a one-page map: activo (inversiones que respaldan reservas), pasivo (reservas técnicas por tipo), capital (requerimiento de capital de solvencia, capital mínimo pagado). Practice classifying each reserva by its trigger event (riesgo en curso vs. beneficio devengado vs. desviaciones).
Treating the requerimiento de capital as a single number and ignoring the correlation/aggregation of riesgos (mortalidad, longevidad, invalidez, gastos, inversión) and the diferencia entre requerimiento bruto y neto de reaseguro.
Candidates learn the individual risk modules but never practice the aggregation step, so they answer with the largest module instead of the diversified total.
What to do instead
Practice full aggregation exercises: compute each module, apply the correlation matrix or aggregation formula, then subtract the effect of reaseguro. Always state whether the result is bruto or neto and which risk dominates.
Mixing up renta vitalicia inmediata, renta vitalicia diferida, renta temporal y renta con periodo cierto, and mispricing the annuity factor (a-n) by using the wrong survival probability or discounting period.
The annuity notation looks similar and candidates memorize one formula (ä-x) without mapping it to the product's payment pattern and deferment.
What to do instead
For each product, draw the payment timeline first: cuándo empieza, cuánto dura, qué pasa si el rentista muere. Then select the corresponding annuity-due or immediate factor and confirm whether deferment requires a deferred survival probability (n p x) multiplied by the annuity at the deferred age.
Ignoring the seguro de sobrevivencia and pension derivada (viudez, orfandad, ascendientes) when valuing a pension, or applying it without the eligibility conditions and porcentajes del marco legal.
Candidates focus on the titular's pension and forget that the benefit stream includes survivor pensions with their own eligibility rules, percentages, and duration limits (e.g., orfandad hasta cierta edad o hasta terminar estudios).
What to do instead
For every pension valuation, list the possible beneficiarios, their porcentajes, conditions and duration, and add the corresponding actuarial present value. Cross-check against the applicable legal framework (LSS or the regime the question invokes) rather than assuming.
Assuming the portafolio de inversiones that respalda reservas can hold any asset, ignoring the régimen de inversión (límites por tipo de activo, calificación, concentración, moneda) and the calce de activos y pasivos.
Candidates treat investment questions as generic finance (maximize return) and skip the regulatory limits and ALM constraints that define the correct answer.
What to do instead
For investment items, first recall the applicable límites y restricciones (activos elegibles, límites por emisor, requerimientos de calificación, congruencia de moneda y plazo). Then evaluate the proposal against those limits before discussing rendimiento.
Confusing the roles of CNSF, CONSAR, SHCP and the regulación de los sistemas de pensiones (IMSS/ISSSTE, cuentas individuales, AFORE) when a question asks which authority issues or supervises a given requirement.
The Mexican pension landscape has multiple institutions with overlapping-sounding mandates; candidates learn the acronyms but not the boundary between supervisión de seguros y supervisión de ahorro para el retiro.
What to do instead
Make a table: institución → qué regula → instrumento (LISF, LSS, ley del SAR, circulares). Practice assigning each requirement (reserva técnica, requerimiento de capital, traspaso de cuenta, comisión de AFORE) to the correct authority and legal instrument.
Answering ética y PLAFT items with generic 'report suspicious activity' statements, without identifying the concreto: momento de la debida diligencia, beneficiario controlador, operaciones inusuales vs. preocupantes, y el canal de reporte.
Candidates treat ethics and AML as common sense and do not study the specific obligations, thresholds and escalation paths in the Mexican AML framework.
What to do instead
Study the obligations as a checklist: identificación del cliente, beneficiario controlador, debida diligencia reforzada para PEP, monitoreo, reporte de operaciones inusuales y preocupantes, conservación de información. For ethics items, identify the conflicto de interés and the correct disclosure/abstention step.
Skipping the unidad de tiempo y la base biométrica (edad cumplida vs. edad actuarial, tasas anuales vs. mensuales, tanto por uno vs. porcentaje) and reporting an answer off by a factor of 12 or 100.
Under time pressure, candidates plug numbers into memorized formulas without aligning units, and the exam deliberately mixes annual and monthly payment frequencies and percentage/rate notation.
What to do instead
Adopt a fixed pre-computation ritual: convert every rate to the same period as the payment frequency, convert percentages to tantos por uno, and confirm the age basis (cumpleaños vs. edad más cercana) before using any table. Write the units next to each intermediate result.